An Unusual Extrusion Texture in Mg–Gd–Y–Zr Alloys
An Unusual Extrusion Texture in Mg–Gd–Y–Zr Alloys
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DOI：
10.1002/adem.201500516
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发表时间：
2016-06
影响因子：
3.6
通讯作者：
R. Alizadeh;R. Mahmudi;A. Ngan;T. Langdon
中科院分区：
文献类型：
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作者：
R. Alizadeh;R. Mahmudi;A. Ngan;T. Langdon
通过EBSD研究了Mg-9 Gd-4 Y-0.4Zr（GW 94）、Mg-5Gd-4 Y-0.4Zr（GW 54）和Mg-5Gd-0.4Zr（GW 50）合金在以19：1和8：1的两种挤压比加工后的织构演变。虽然合金在8：1的低挤压比下显示出常见的挤压织构，但在19：1的高挤压比下在GW 94合金中观察到不寻常的挤压织构，其中（0001）基面垂直于挤压轴对齐。这种不寻常的织构在较低的挤压比和/或较低的合金含量下降低。提出了稀土（RE）元素通过在溶质对晶界的拖曳效应和富RE沉淀物的钉扎效应中延迟再结晶来修改织构。
Texture evolution is studied by EBSD in Mg–9Gd–4Y–0.4Zr (GW94), Mg–5Gd–4Y–0.4Zr (GW54), and Mg–5Gd–0.4Zr (GW50) alloys after processing with two extrusion‐ratios of 19:1 and 8:1. While the alloys show common extrusion textures at the low extrusion‐ratio of 8:1, an unusual extrusion texture is observed in the GW94 alloy at the high extrusion‐ratio of 19:1 with the (0001) basal planes aligned perpendicular to the extrusion axis. This unusual texture decreases at lower extrusion‐ratios and/or lower alloy contents. It is proposed that rare‐earth (RE) elements modify the texture by retarding recrystallization in solute drag effects on grain boundaries and pinning effects of RE‐rich precipitates.