THE EFFECT OF GRAIN-SIZE ON DEFORMATION TWINNING IN A TEXTURED ZINC ALLOY
THE EFFECT OF GRAIN-SIZE ON DEFORMATION TWINNING IN A TEXTURED ZINC ALLOY
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DOI：
10.1007/bf00541848
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发表时间：
1983-01-01
影响因子：
4.5
通讯作者：
RALPH, B
中科院分区：
文献类型：
--
作者：
ECOB, N;RALPH, B
在室温下测量了商用轧制锌-0.1%铝-0.05重量%镁合金样品中变形孪晶的发生率，作为应变、晶粒尺寸和相对于轧制方向的载荷方向的函数。孪晶材料的体积分数已在表面和本体中测量。结果表明，在大多数情况下，该体积分数是应变和晶粒尺寸的线性函数。发现通过自催化机制，在拉伸样品的标距长度上形成不均匀的重孪晶晶带。给出了孪晶和晶界滑移带相互作用的几个例子，说明了孪晶的形成和调节。与本体相比，在表面发现的孪晶体积分数较小，反映了冯·米塞斯准则的放宽。
The incidence of deformation twinning in samples of a commercial rolled zinc-0.1% aluminium-0.05 wt % magnesium alloy has been measured at room temperature as a function of strain, grain size and direction of loading relative to the rolling direction. The volume fraction of twinned material has been measured at the surface and in the bulk. It is shown that this volume fraction is a linear function of both strain and grain size in most cases. Bands of heavily twinned grains are found to form inhomogeneously across the gauge length of tensile specimens, by an autocatalytic mechanism. Several examples are given of the interaction of twins and slip bands at grain boundaries which illustrate the formation and the accommodation of twins. The smaller volume fraction of twins found at the surface compared with the bulk reflects a relaxation of Von Mises criterion.