Achieving high strain rate superplasticity in Mg–Y–Nd–Zr alloy processed by homogenization treatment and equal channel angular pressing
Achieving high strain rate superplasticity in Mg–Y–Nd–Zr alloy processed by homogenization treatment and equal channel angular pressing
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DOI：
10.1016/j.msea.2015.03.011
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发表时间：
2015-05
期刊：
影响因子：
6.4
通讯作者：
Z. Kang;Lianli Zhou;Junyi Zhang
中科院分区：
文献类型：
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作者：
Z. Kang;Lianli Zhou;Junyi Zhang
采用均质化处理和等通道转角挤压工艺对Mg-Y-Nd-Zr合金铸锭进行了研究。获得了均匀的晶粒，晶粒度约为1.5μm，晶界有球状第二相优先分布。在500℃、1×10−1s−1和475℃、2×10−2s−1条件下，分别获得了860%和960%的高应变速率超塑性，这是镁合金首次获得如此高的高应变速率超塑性。在475℃，3×10−3S−1时，延伸率达到最大值1120%。这主要归因于均匀细晶组织的热稳定性和第二相的配位作用。
Homogenization treatment and equal channel angular pressing was applied to Mg–Y–Nd–Zr alloy cast ingot. Uniform grains with a grain size of ~1.5 μm and spherical secondary-phase preferentially located at the grain boundaries were obtained. Excellent high-strain rate superplasticity of 860% and 960% was achieved at 500 °C, 1×10−1s−1and 475 °C, 2×10−2s−1, respectively, for the first time such a high-strain rate superplasticity was achieved in magnesium alloys processed by ECAP. The maximum elongation of 1120% was achieved at 475 °C, 3×10−3s−1. They were attributed to the thermal stability of uniform fine-grain microstructure and the coordination function of secondary-phase.