作者submarine (submarine)
看板NTHU-MSE14
标题材导期中第七题给分标准
时间Mon Jan 3 19:40:29 2011
第七题 配分十五分
标准答案:
A 10%
grain refining
GBs block dislocation slip
solid solution strengthening
Solute atoms, in case of substitutional solid solution, creat stress
fields around themselves and hinder the dislocation movement.
strain hardening
cold-work increase density of dislocations and dislocation interlock
each other and hinder their movement.
绿色部份答对第一个给2分,其余给1分
蓝色部份给2分
部份同学认为Cold Rolling应该给分,Cold Rolling属於Strain hardening的一部份
但不能代表strain hardening.
B 5%
Loss of ductility.
Restore by thermal annealing
红色部份给1分
黄色部份给4分
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