Microstructures and mechanical properties of friction stir processed Mg–2.0Nd–0.3Zn–1.0Zr magnesium alloy
Microstructures and mechanical properties of friction stir processed Mg–2.0Nd–0.3Zn–1.0Zr magnesium alloy
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DOI：
10.1016/j.jma.2013.06.001
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发表时间：
2013-06
影响因子：
17.6
通讯作者：
F. Zheng;Yujuan Wu;L. Peng;Li Xuewen;P. Fu;W. Ding
中科院分区：
文献类型：
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作者：
F. Zheng;Yujuan Wu;L. Peng;Li Xuewen;P. Fu;W. Ding
研究了搅拌摩擦工艺参数对挤压Mg-2.0Nd-0.3Zn-1.0Zr（wt.%）合金组织和性能的影响合金进行了研究。在800 rpm的工具旋转速率和200 mm min-1的横向速度下，用不同的道次（单道次、三道次和五道次）对合金进行摩擦搅拌处理。FSP显著细化了挤压态合金的晶粒（3道次平均晶粒尺寸≤ 3.8 μm），Mg 12 Nd相几乎完全溶解在基体中。随着道次的增加，搅拌区（SZ）的平均晶粒尺寸先减小后增大。所有FSP处理试样中的SZ的维氏硬度均高于母材（PM）。室温拉伸试验表明，搅拌区沿着FSP前进方向的拉伸强度略低于粉末冶金。然而，延伸率从粉末冶金的13.0%显著提高到SZ三道次FSP的24.5%。这些改善的拉伸性能归因于组织细化、动态再结晶和Mg 12 Nd相的溶解。
The effect of Friction stir process (FSP) parameters on the microstructure and mechanical properties of an extruded Mg–2.0Nd–0.3Zn–1.0Zr (wt.%) alloy was investigated in this paper. The alloy was friction stir processed with different passes: single-pass, three-pass and five-pass, under a tool rotation rate of 800 rpm and a traverse speed of 200 mm min−1. FSP results in remarkable grain refinement of the extruded alloy (average grain size ∼3.8 μm as 3 passes) and almost complete dissolution of the Mg12Nd phase in the matrix. With the increase of pass, the average grain size in the stir zone (SZ) is decreased firstly and then increases. The Vikers hardness of SZs in all FSPed samples is higher than that of the parent material (PM). Tensile tests at room-temperature show that the tensile strengths of the stir zones along the FSP advancing direction are slightly lower than those of PM. However, the elongations are remarkably improved from 13.0% for PM to 24.5% for SZ FSPed with three-passes. These improved tensile properties are attributed to the microstructure refinement, dynamic recrystallization and dissolution of the Mg12Nd phase.