材料学基础15.ppt
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1、材料科学基础Fundamental of MaterialsProf:Tian Min Bo Tel:62795426，62772851 E-mail:Department of Material Science and EngineeringTsinghua University.Beijing 100084Lesson fifteen4.8 Twinning(I)Macroscopic Aspectuu.uu.Rules governing the change in length.1.1.Change in shape of a hemisphere with unit radius.C
2、hange in shape of a hemisphere with unit radius.before twinning:before twinning:2.Undistorted planes and directions.Undistorted planes and directions.Twin elements K1、1，K2、2K K1 1 1 1K K2 2 2 2FCCFCCBCCBCCHCPHCPFCCK1,1K2,2BCCK1,1K2,2ca1a2a3HCP3.4.Rule for elongation or reduction of R.D.Rule for elon
3、gation or reduction of R.D.All R.D.in the region where All R.D.in the region where K K1 1 and and K K2 2 makes an makes an obtuse(obtuse(acuteacute)angle will increase()angle will increase(reducereduce)its length)its length after twinning.after twinning.CDuu.Application:take HCP for example Suppose:,Suppose:,23ac/2ca1a2a3HCP(I,II)(I,II)(III,IV)(III,IV)(V,VI)(V,VI)A AB BC CDDExamples and DiscussionsExerciseThank you!15
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- 材料 基础 15
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