final2002 - MAT 033 Engineering Ma Leriuls and Prucesses...

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Unformatted text preview: MAT 033 Engineering Ma Leriuls and Prucesses 200% Fall Finnf Exam December 15. 20:]: NAME ' Section Profcssor Soukhnjak Th 12:11] Prnfesmrflickm Th |:ID mecssor Pearson F 3:13‘ Profcsser Pearsnn F 91f! mecsmr than F 10:10 Plensa wrllt your final answer: in blanks pmfifled, when: appmprlate. Biased book. This eum 3 worth mu points. Cnlculalur Policy: I have cleared my calculalur's memory prior tn» taking this exam. {Sign here.) J]. -flE “inf”: kT C C _ Q - 3. 41—4.. _2._ mD_lnA-fi_ g—Acrnrrr CFC“ =11"sz E=So+kdlln 5:13:15“; D=DoeimT G=UDE'EI"11‘T _ R=B.3I —J—,h k-13.ax 10-24 TL N1... - Nup[%] x - YES "101' K K _ _ “J Hui E—afa L-DfiCIfix 5-.- 1 [=12 =J:_ =E =E - EL 0 An a; A a La E1 InLfl t-ucoslcmfi TIE—h G=H-TS F=C~F+1 2M Pam“ REA—1L— HV=lJ2£r mama-50m nD {D-sz- :11) a? k=i.fi1:1fl"=vfl( ficw=fl11m 6:554”- D=DDWRT n=me+fiam I+ Multiple Choice {lllllI put.) Place the letter corresponding to the single, beet answer in the apprepriale hlank en the answer sheet. Crystallography, Detect: and Bonding 1.) 2.115 crystallizes in the zinc blenne alrueture. The S aterna are located at the rec lattice positions in a ennventinnal unit cell. while the Zn elem fill a function of the tetrahedral mitts. [f the total number of aetrahedrel voids in a unit cell is 8.1-rhat Erection are fiIIed'.’ a.) 11"! 1:1.) 1.92 c.131'4 d.) 1 2.} A11 example cf Sehettlty disnrtler in CaCl ia a (25‘ {when} vacancy and a a.) Cl" vacancy in.) CT interstitial c.) Ca‘ interatitlal d.) Br' impun'ty 3.) The equilibrium vacancy fraction in a metal at temperature T - EDD-“C having a vacancy formatinn' energy of L5 e‘v' is approximately - 1:12.11 :1 111“ h.) 1.61 1: III” e.) 11.35 110'” 11.12.24 1 10" 4.} The most densely packed planes {i.e_, having the highest planer atenuc density} in a he: emu-flute belong In the family 3.}{1EIJ} b.) {110} mil-[111} d.}{121} 5.) The meat liker slip planes in pure Cu belong he the fmu‘ly a.) {101:1} a} {110} c.) {111} 111(121} 15.11 Suppose that one identifies a {ae—ealted pn'mi live} cell in a fee dtruntute that contains one atom [f the lattice parameter is a. then the volume nl'This cell ia I.) I’M It.) all? £113 11} 2 3” T.) What are the Miller indicea for the plane shnwn below? 1.1 {313) a.) (1131 1:.) (113) d.) {I T31 1 [a «‘1‘ q T 3.} What is the cryatlllugrlphic direch indicated ii: the figure blow? _ 341323] b.) [323] a.) [233] d.) [332] 2.33 K 9.] The likely self-diffusion mechanim DfCu in elemental. single-crystal Cu is the e.) vacancy mechanism. b.) interstitial mechanism. c.) grain—bouan mechanism. :1.) inlerslitialcj' mechanism. 10.) Which of the fulltm'ing CllflIIEIlIiEIIlC-E apply to the ionic bend? a.) directional. involves an clecirut: cluutl. b.) direclienll. involves electron mnsfer. c.) nondirectiunal. introl re: an elecmn cluud. 12L] Inc:n:|:l’.ii’et:lit:|mil1 invades electmn. transfer. 1 l.) The atomic rediLts for Cu is {11213 um, and its atomic mass is 6354 gimme. Assuming a hud— sphere model for crystalline Cu. its thenretical density is about Ll 3.93 glamJ b.) 9.92 ycm’ c.) 111!) glcm’ d.) 12.55 glen!" 12.} The Ieletiunship between the Burgers vector. In. and the line direction. I. of a straight edge dislocation is given by: a.) I} is parallel to L b.) b is perpendicularm l. a.) b is anfiparlllel In L d.) b and l are neither suittly parallel.” perpendicular. Preclpltaflon Hardening The following questions refer to the precipitation hardening demotion-noon of an Al -4 wt “E Cu alloy done in class. As you will recall, several cylindrical rods were prepared by first sol ution'tzing them and then subjecting them to a quench to low (i.e., well below room] remperlture. Prior to the demonsu'ntion the rods were kept in e freezer over night. [3.) The purpose of the solution treatment was to a.) promote work hardening by creating entangled dislocation nee-rocks. [3.] promote recrystallization via the creation of stain-free grains. c.) ensure that the system translated of a. single solid {or} phase. d.) allow the system to age artificially. 14.] Two rods 1were plleed in I furnace at a temp: nit-ore nfnbnut 300 “C. one for 20 minutes and the other for nearly 3-D min Lures. The purpose of this heat treatment: was to I.) naturally age the speointens in order to soften them. it.) artificially age the specimens in order to produce fine preeipi later. c.) nrticially age the specimens in lrrrrtlier to prostate nucleation ofstfljtt‘free grains. drl harden the mime": vi! the production of ntnrtcnsirc. 15.} One difficulty that could have been encountered if the specimens had been left in the furnace tern long is lhat ' a.) the)r may hare averaged. resulting in excessiver high strengths. is.) they on] have avenged. resulting in strengfl'ls less then the rrtartimum possible. e.) they Etta}r outrage with the production of ruanensite, it} they may undemge. resulting in a low yield strength. 16.) After hearing in the furnace. the samples were water quenched prior to mmprjug [a bend them. The purpose of this water quench was to a.) more!)' to cool the sample. It.) cool the smrple and produce I single solid {ct} phase. e.) cool the sample and enhance The aging process. d.) cool the sample to promote reoove r3. Electricsl Properties 17".} The conductivity ofCu. up-Un addding small amounts ofCr, Iwill I.) decrease. It.) increase. c.) rcrrtain unchanged. do} first increase and then fluctuate lti:|.'|tlrlarrilieu}r with Cr concentration. 13.}1‘h: punducfi 1rin of A1 at room tempumtura is 3.3 1 1E!" {Ea-m” . If an Al wire that is :u m long experiencas a voltage: drop of less than 1.1] V While carrying 3. cu mm of 5 A. than its minimum diamar is a.) 0.2 mm b.) 11.5 mm :.}1.ID mm d.) 1.3 mm. 19.} The number of holes in intrinsic G: will, upon increasing rh: mmpnmurc. IL} appraise. b.) increase. c.) rcmajn unchagcd. d.) increase and deems: sinusoidalljr with increasing mpcram. In.) Which tangy hand descfiph'uu is maximal with Hut of m insulin-I? I 3,} ml. unfilled “lune: hind separated from a filled conduction band by l 2.5 e'V hand sail ' h.) A filled conduction band mud from an mnfiafiy empty valence band by a 2.0 W band gap. c.) A filiad valema band pupa-ma fram a cunducfiun hand by I {1.67 eh" hmd gap. d.) A filiad wimp: bend lepenlctl from an :mnfiafly empty mndulrlion band by a a: :V bud glp. Phase Diagram The folio-wing quesiiuna nfcr to It: Ti-Ni phase dim alian hclmr. hilarity-mum u m It all In In a 11: H II mu 5; Law i II“ ; 21.} On: outwit reacfion {upon cooling] found at tmnpmruros gnaw than lDflO‘C is u L -:- m Ti) + TiNi u.) L .: TiNi + Tim, c.) (a Ti} 4. {:1 Ti] + TiINi d.) L o {a T1) + Tam 22,13 50m I3&Ti-5I:|wt‘liaNinlloy is slowly coolodfrom I4D0'lelm'c. Win the first solid phnsa to form? I.) T1Ni h.) TilNi c.) TIM, Ii} {fl Ti} ' 2.3.} For which of the following alloy composition: dooa H1: 51mm: consist of roughly oqual wolght fmfions of solid phasu. at IW'C? aJEflwl'ETi-Zflwl‘hNi b.) flm'fiTi—‘lfimflnifiii c.) SZMETi—fifi wl'fiNi d.)10m%Ti—90m$fli 24.) Suppose that I93 M‘ETIHT wt “I: Ni wuaimrly ooolodfrom lWD'C. Whalil tho composition of tho procude plus: that is formad? L355 m firNi 11.13"! wt '1': Ni mumom Mfimfim 3.} Th: fom‘otioo oftho prooumtoid phuo :1 1h: {:3 Ti] grain houndu-ios ofoccurs bocauso a.) dofocts ofion catalon nucleation. h.) 5min boundaries inhibittho mollon ofdislocationa. +2.} (H Ti} in rich in Ni. 11.} The proeunactnid plus: i: mountable. 16.} What is the weighl. Iranian of the onloohoid pinata fanned whon a 93 wt 9% Ti — T wt 9a Ni is slowly cooled just below EST? .4 on: b.) mm c.) 0.59 :1.) 0.95 Mechanical Propertles 1T_}5uppase that an aluminum sheet with an initial thieitrless ofimfifil- inches is oold rolled, producing a sheet with t final thickness offlM inches. A second aluminum sheet with. an initial thickness DIODE inches is to be cold rolled so as to have the same tensile strength as the first. What must be its final thickness? a.) 0.03 inches b.) 0.04- inches e.) {105 inches d.) 0.06 inches 23.} The problem of brittleness in a martensitic steel can be mitigated while still retaining substantial hardness by at} quenching. h.) tempering. c.) sustenitizing. d.) doping. 29.) A Chili-inch dismeter aluminum he: is subjected to a force of 1500 Hi. What is the {Ippmitimnle} donespnoding engineering stress? a.) 3000 lhi'in' h.) 31m Ilzn'ila1 c.) 9425 Win1 d.) 127m lhi'ln' an.) The Young's modulus. E. for metals such as Cu and Ti is an the order of about a.) 10 MP: h.) 100 MP: c.) I GP: d.) tun GP: 31.} A hardness test is perfumed on a 103i] steel resulting lII [small indentltion. In order to verify the hardness measurement a second test is performed and the nest indentation is made extremely close to the first How will the value of the semnd hardness measurement complle with that of the first? a.) ll. will libel}I be higher due to cold working. It.) It will likely be higher due to the touristic-n of omnsite. c.) It will likely be higher due to large changes in local carbon eomposidon. :1} It will lilter be lower as recovery is promoted. 32.} The recrystallizsliun of a metal is ehmtcterized by a.) an inns-ease in strength. It.) sdeerease in ductility. c.) cooling. d.) the nucleation of Strain-free grains. 31m brass specimen having 1 length of lill.6 mm and a diameter of 19.0 mm is pulled in tension, with a resulting elmgatleu of [1.15 mm. Given that the defamation is elastic and that this eiluy has a Poisson ratio of 0.35. what is die associated ted uctiuu in dine-tater? ' L} 5.3 1 [04mm 1:.) 5.2 x 10* mm c.)- UJZS m d.) 1.135 mm 34.) In analyzing the results of 3 Fatigue best eue typically plats IL) stress amplitude we. number of cycles to failure. In.) engineering stress ifs.l£fl1l'.l.'ll'atl.ll'¢. c.) engineering streee vs. engineering min. IL] emin vs. time. 35.] 'i'he limit.ng sues: level below which in fatigue failure will not occur is the I.) .hllzllll‘ttiiit}I limit IL} strain limit It.) tensile limit d.) endurance limit Tmuufurmltieu Kinelins Imam-{Int 36.} What final ndcrostnicture results from heat trestl'hettt s? a.) 10‘.) hi fine pcsdite in.) SCI 9b fine pesrlite —50 9b martensite c.) 511 “E: coarse pendite- SD fir msrteusille d.) it!) We mar-tensite 3?.) How would the hardness of the specimen produced from heat h-eabnent A compare with that produced by heat tl‘eahnent B“? ' a.) Heat tresmrent A produces the harder structure. b.) Heat treatment 13 produces the harder meme. 1:.) The hardness-cs are very nearly the some. d.) It is impossible ho know. Ceramics 33-} Ntlwfifli Midi-flail Sill-11 as CEO. are added to silica glasses to 1.] promote crystallization. b.) reduce its viscosity and mslte it easier to form. c.) increase its viscosity and alter its strain point. d.) increase its viscosity and slter its annealing point. 19.} Which of the following statements best describes the sintoring process? 8.}The1'e is substantial local melting,r as particles coalesce. h.) Particles coalesce by solid-state diffusion at tempershrres below the melting point. e.) The porosity in the structure increases substantially upon sintering. LL] Neck fonnsu'on is followed by a quench to density the sample. 40.]: A. piece ofccrsmic wall tile having dimensions 5mm 3: [00mm :t 1011an absorbs 2.5 g of Witter. What is the apparent porosity of the tile {expressed as a volume parcent}? s.) 1.15 b.) 2.5 c.) 3.0 d.) 3.5 Iron-Carbon System The following questions refer to the Fe-C system. A portion of its phase diagram. is shown below. Call-pulth II?- n u I z 3 I. s 5 MD IN Wm“ turn I: 4L] A 0.3 wt in C 21.1de SIGUI is alarwa couled from 150 'C unjust below 1'3 “C. What ii the weight puma: of cutter-aid fen-it: that i3 font-tad? a.) 11:: at b.) 28.5 H: c.) 51-:- at. +1.13” at 42.31% 0.4 wt it C ml is alum-wk.r coulad from WC to just. beltm T23 'C. What is flat: weight percent of pracumxuitl innit: prascnt 1n the EMS” usage man; :4 "1'31: :1.) an; 43.) A plum cubon ml domain: 42 wt in. procutectuid fart-int. What in it: twang: C mutant? 3.] 0.22 wt in C h.) {135 wt "In C c.) 414'? wt * C d.) 0.6? wt it C 4-4.} A. 1020 steel and a Will) steel are subjected in the same hes: treatment. Which is likelyr to be harder? a.-}I the MEG steel. In.) line 1030 sleel 6.} Easy will he squall}f hard. 11.} it is impossible to know. 45.) Which of the following phases have s be: arrangement of Fe slams? :1.) l1 and b b.) o and T c.) T and 5 :1.) liquid Mllscflhnenua 45.}1'he diffusion coefficiean for Fe in Ni are given a: two iempezsxures below. What is the associated activation energy [in Uimole)? a.) 203.3 b.) 252.4 3.} 321.1 Ii.) 344.0 %% 4741:: a. process analogous In the calhurizeliun efsteel, impurities are allowing to diffuse into a silicon were: no change its elem-lea] propenies. ifule gallium oorleenlrm‘ou in silioon is In“ ammslm’ s: a depth of 1 pm {10" mi arm as hours. how long will it m to achieve the same oonoentmien level at a depth of 3.0 we? [The hamperuure. surface mneenlntiun. em. are held fixed.) a.) 3.0 hours b.) 4.5 hours s.) 6 hours Ii] 7.5 hours 43.} ldflnlif)’ the chemical structuml unit for a lhennoplutil: shown below. I.) polyethylene h.) polystyrene C-l polrpmlllllsm d.) polyvinylohlolide 49.] The process of vulcanization of rubber developed by Goodyear leads tu mfllinkieg when the rubber is mixed {and heated} wilh lead cutout: and a.) Cl e] K 'c.) S ' .5.) Fe 50.} A {rm-min; pro-eels in whim. for example. I metal billet ie forced Mug]: I. die by a compressive force in a.) forging h.) extrusion e.} rolling d.) hrlzlng II.}II Short we: or Calculation {5|} p15.) 1.] Fer the conductivity dam planed below, deftennine the bud- gap energy (in eV} for inm‘mie silicon. For referenee, recall that the tempermu'e dependence of the emdueuvlur fee: In inn-i nsie semiconductor is given by where E' is the bend-gap energy. -E - _L or a. exp{2 H] T, K 1200 son 50:} 300 0, [fl'm)" 0:001 e002 hens 1x9". K" 2.} From the data zinc in tho table below. rata that me ralaijva aolid soiuhitity of the following :lamanta in Cu as eium ‘high’. if you expect the maximum aolubility to b: in oaooas of 50 atomic *5. or ‘Iow', if you output: the maximum solubility to be less than 50 anomic ii. For those oiomauta that you ratad ‘low‘. briefly iodioato flu: rational: for your decision. Plano our anawora in the sum = table. as indicated. 3.) A wire with diamotord and length Emu-5t any a current I. The W power diaipation along tho win is P. Doriya an expression for the conductivity in the wire in tenant of i. I. P and d. and plan: your tumor in tho blank provided. [Note that power in voltage I cannot} Also. docidc whether this is fill maximum or tit: minimum aiiowoo muducfiviry. and cit-cit. the appropriate choice balm-r. Conductivity = Maximum conductivity or Minimum conducliy'ity [Cirolo Irina.) 4.151.1pr that a creep test is conducted on a manic s'pecimen. On the cues provided below. sketch the results uf a typical real. ‘3: sure to clearly label the ms 5:: as e: indicale which quantifies are being plotted. Also. indium graphically how one would determine .thc steady-state creep agate. s.) Fol-the elcw cocliug processes indicated below. idenfify the nficrceu‘ucmre emcee-ending In each labeled am: by placing the appropriate letter next to the comet stench. -. ' III- Ceramics (25 puts.) 1-) a.) tht in the basic building block that makes up the structure of silicate glasses? b.) On the am bcIuW. sketch graphs of thc expected dcpcndcncl: of viscosity on temperature for both sud-dim: {window} glass and fund silica. Note that the us; cf the graph u: Inhaled Intvismaity} Ind tempcraturc. cn'mbllite to compare with that-1f I. silica glass? Briefly explaiwuur answer. 2.} a.) The following grid: represent Eh: {100} and {110} plane: in 111: unit ccll of Natl. Mark m: pmilims of the Na‘ and Cl' ions using Ih: symbols indium. fi {100}. {110}_ b.) For the {100} mad the {110} planes, Whit Is :11: ratio affine ionic planar density {1H3} values. what: [PD is definfld by Ill: EDI.“ HPDum = c.) Wifl: nfcrcuc: to the NaCI sun-mare. cation defect. IV. Pulymmffifiph.) , . 1. I.) Draw The chemical structure and cumpute the main-:qu might of :11: vinyl chloride [Dar-IDENT- Calculau: the number-“mg: nmletular weight iftbc number-warty dag-m: at p01 ymnrizatiou is 10.000. Draw the matures for auntie and isometic polyvlnfichlofidm Auntie: IsotIcIic: 2.} List and fifth: fduhjrm nfcnpulmrs cram gamma ti: prm'idc polymer: with impmmd combinations ufpmpcnien: ' Name: Radiation Section {Circle fine.) 1:10-1:00 PM Fri. 5: ID-EGDAM Frl. 10:10-llmAM Th. 1:10-2:03 PM Fri 9:1(1- 10:00 AM l'irlulflple Clinic: - Alli'fl'fll'stltfl ...
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This note was uploaded on 02/09/2008 for the course MAT 33 taught by Professor Keith during the Fall '07 term at Lehigh University .

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final2002 - MAT 033 Engineering Ma Leriuls and Prucesses...

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