Completed_Module_08_-_Mechanical_Propert15

Completed_Module_08_-_Mechanical_Propert15 - Lecture Module...

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Unformatted text preview: Lecture Module 8 — Mechanical Properties 6. Creep in Materials l (i) Creep is permanent (plastic) deformation occurring in a material at high temperature under constant load over a long time. (ii) Creep happens in both metals and ceramics. o Orr/Durham} I'n Ceramics JUL ”’0 mans [4314—ka 54chqu affkra‘hcvq o €3~ 4(4va ruler i‘n 0‘ch end 7N or a skew». pow-crec' ?M.IAJMV~ ‘0' 5((CNJ I‘mPo/Jav-J 0+ TQMP> ’V 0", TOW“ F° (iii) Mechanisms of Creep. o mechanisms of creep are dependant on diffusion as atoms and vacancies diffuse in a direction to offset stress in the material. (a) Diffusion of atoms and vacancies 0 Varanc €64 "“5ch 4' (C’WlfNSS'Ve N Pei/Q: C (NQLfoO' ”fir-K3 WHAQVHSW‘) . dun»; Ml. rah, 4‘ «hug-ft, N. "6%.? ‘ a o , \ .Jmln bawxéara d"'-¢£\a$\‘cvx is Ve’a 'WPWW "" C’ur( (”He m‘kam‘w‘) (b) Dislocation climb o OCH/tr; as vacancy; A£LAR+g-:\'3C21ncy ”H“? Ji‘SlGCa-iiron § 06 (Mrs Wiluflfk 6"“:h‘ ..... § “' A's‘ocfi‘L‘rW‘fi c‘l‘mgs up b ——-.—- (a) (M 8-15 ...
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