Evolution of microstructure and texture of cold-drawn polycrystalline Ag with low stacking fault energy

Evolution of microstructure and texture of cold-drawn polycrystalline Ag with low stacking fault energy
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低堆垛层错能冷拉多晶银微观结构和织构的演化

DOI:
10.1007/s11431-015-5862-8
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发表时间:
2015-06
期刊:
Science in China - Series E: Technological Sciences
影响因子:
--
通讯作者:
Yan Wen
Yan Wen
中科院分区:
其他
文献类型:
--
作者:
Ma XiaoGuang;Chen Jian;Chen Zheng;Yan Wen

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利用透射电镜和电子背散射衍射研究了多晶Ag在拉伸过程中的组织和织构演变。结果表明,在低应变下,存在形变孪晶和不缠结的离散位错。当应变增加到0.58时,大量高密度位错墙和微带形成。同时,有些双胞胎失去了60°的孪生关系<111>。当应变为0.94时,位错界和孪晶界均向丝轴方向旋转,剪切带开始出现。当应变大于1.96时,大部分边界平行于拉伸方向。织构分析表明,随着应变的增加,复合织构组分的体积分数减少,而复合织构组分的体积<111>分数和<100>织构组分的体积分数增加。然而,当应变高于0.58时,各织构组分的体积分数随应变的变化不明显。对于具有低堆垛层错能的多晶Ag,容易形成复杂的织构组分。
The evolution of microstructure and texture for drawn polycrystalline Ag was investigated by transmission electron microscopy and electron backscattering diffraction. The results show that there are deformation twins and some un-tangled discrete dislocations at low strains. When the strain is increased to 0.58, a lot of high density dislocation walls and microbands come into being. At the same time, some twins lose the twinning relationship of 60°<111>. At a strain of 0.94, both dislocation boundaries and twin boundaries will rotate to the axis direction of wires and the shear bands start to appear. When the strain is higher than 1.96, most of the boundaries are parallel to the drawn direction. Texture analysis indicates that with the strain increasing, the volume fraction of complex texture component decreases, but <111> and <100> texture components increase. However, the variation in the volume fraction of each texture component as strains is not evident when the strains are higher than 0.58. For polycrystalline Ag with low stacking fault energy, complex texture components are easily formed.
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