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A single crystal Ni (in FCC) alloy bar is uniaxially pulled along [-123]. The bar starts to yield at σ =100MPa by slipping on (111)[-101] which hence is the most favorable slip system.

A single crystal Ni (in FCC) alloy bar is uniaxially pulled along [-123]. The bar starts to yield at σ =100MPa by slipping on (111)[-101] which hence is the most favorable slip system.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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A single crystal Ni (in FCC) alloy bar is uniaxially pulled along [-123]. The bar starts to yield at σ =100MPa by slipping on (111)[-101] which hence is the most favorable slip system.

(1) Determine the critical resolved shear stress TCRSS for this Ni alloy. (2) Another single crystal bar made of the same Ni alloy is uniaxially pulled along [oī2], and the most favorable slip system is determined to be (1ī1)[ T01]. Determine the yield strength for this single crystal bar (with loading axis along [oī2]). (3) A bi-crystal is a polycrystalline material with two grains. Here, a bi-crystal bar made of the same Ni alloy contains two grains: grain 1 with [123] along the bar axis and grain 2 with [o72] along the bar axis. If we uniaxially pull the bar, determine which grain would yield first based on the results of (1) and (2) above. Grain 1 Grain 2
Transcribed Image Text:(1) Determine the critical resolved shear stress TCRSS for this Ni alloy. (2) Another single crystal bar made of the same Ni alloy is uniaxially pulled along [oī2], and the most favorable slip system is determined to be (1ī1)[ T01]. Determine the yield strength for this single crystal bar (with loading axis along [oī2]). (3) A bi-crystal is a polycrystalline material with two grains. Here, a bi-crystal bar made of the same Ni alloy contains two grains: grain 1 with [123] along the bar axis and grain 2 with [o72] along the bar axis. If we uniaxially pull the bar, determine which grain would yield first based on the results of (1) and (2) above. Grain 1 Grain 2
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