Jan 21 2011 - I. The paper Rhenium Additions to a Ni-Base...

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I. The paper “Rhenium Additions to a Ni-Base Superalloy: Effects on Microstructure, by A.F. Giamei and D.L. Anton” refers to MAR-M200 alloys, and according to Deformation-Mechanism Maps, The Plasticity and Creep of Metals and Ceramics, by H. J. Frost, and M. F. Ashby, Cambridge, MAR-M200 is a nickel-based superalloy strengthened by a solid solution of W, Co and Cr, and by precipitates of Ni 3 (Ti,A l ) and carbides of the types M 23 C 6 and M 7 C 3 . A typical composition is given below: Nominal composition of MAR-M200 in wt.% Al Ti W Cr Nb Co C B Zr Ni 5.0 2.0 12.5 9.0 1.0 10.0 0.15 0.015 0.05 Bal Alloying lowers the melting point substantially (to 1600 K), and raises the shear modulus slightly (to 80 GN/m 2 ) compared with pure nickel. The dispersion of Ni 3 (Al,Ti), superimposed on the heavy solid-solution strengthening of the W and Cr, gives MAR-M200 (and alloys like it) a yield strength comparable with the ultimate strength of pure nickel, although it is less dependent on temperature. Above 1000°C the
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This note was uploaded on 11/14/2011 for the course EMSE 335 taught by Professor Cawley during the Spring '11 term at Case Western.

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Jan 21 2011 - I. The paper Rhenium Additions to a Ni-Base...

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