Forging induces changes in the formability and microstructure of extruded Mg96Zn2Y2 alloy with a long-period stacking order phase
Forging induces changes in the formability and microstructure of extruded Mg96Zn2Y2 alloy with a long-period stacking order phase
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DOI：
10.1016/j.msea.2012.11.072
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发表时间：
2013-02
期刊：
影响因子：
6.4
通讯作者：
M. Noda;R. Matsumoto;Y. Kawamura
中科院分区：
文献类型：
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作者：
M. Noda;R. Matsumoto;Y. Kawamura
通过对不同锻造温度和不同α-Mg相晶粒度的锻造试验，研究了加工温度和晶粒度对挤压镁合金塑性和流动应力的影响。在锻造温度为573K-673K，初始应变速率为3.5x10−1s−1的条件下，挤压镁合金的锻造极限高度降低了65%。通过产生细晶的α-Mg相和大角度倾斜的带扭结的LPSO相，可以改善LPSO型镁合金的成形性能。硬质LPSO相在晶界的弯曲角度约为100°，具有较大的变形能力。在LPSO相中，约10%的锻造是形成扭结带所必需的，这些扭结带随着塑性变形的增加而不断变形。
We examined the effects of the processing temperature and the grain size on the ductility and flow stress of extruded Mg96Zn2Y2(atom%) alloy by upsettability testing at various forging temperatures and for various grain sizes of the α-Mg phase. The extruded Mg96Zn2Y2alloy showed a forging limit as a reduction in height of 65% at forging temperatures of 573–673K and an initial strain rate of 3.5×10−1s−1. The formability of LPSO-type Mg alloys can be improved by the production of an α-Mg phase with small grains and a LPSO phase with kink bands with a large-angle tilt. The hard LPSO phase has a bending angle of about 100° at the grain boundaries and has a large deformability. Forging of about 10% is necessary for the formation of kink bands in the LPSO phase, and these kink bands deform continuously with increasing plastic deformation.