Influence of Li₂Sb Additions on Microstructure and Mechanical Properties of Al-20Mg₂Si Alloy.

Influence of Li₂Sb Additions on Microstructure and Mechanical Properties of Al-20Mg₂Si Alloy.
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Li2Sb添加对Al-20Mg2Si合金显微组织和力学性能的影响

DOI:
10.3390/ma9040243
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发表时间:
2016-03-29
期刊:
Materials (Basel, Switzerland)
影响因子:
--
通讯作者:
Jiang QC
Jiang QC
中科院分区:
其他
文献类型:
--
作者:
Yu HC;Wang HY;Chen L;Zha M;Wang C;Li C;Jiang QC

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研究发现,Li2Sb化合物在凝固过程中可以充当初生Mg2Si的核,使初生Mg2Si的粒径从~300μm减小到~15~25μm。由于Li2Sb核和Li原子吸附中毒的协同作用,Li-Sb复合修饰初生Mg2Si的效果优于Li或Sb单一修饰。当Li-Sb含量从0增加到0.2并进一步增加到0.5 wt.%时,粗枝晶转变为有缺陷的截角八面体,并最终转变为完美的截角八面体形状。添加Li和Sb后,Al-20Mg2Si合金的极限压缩强度(UCS)从~283 MPa增加到~341 MPa,0.2%偏置时的屈服强度(YS)从~112增加到~179 MPa,而均匀伸长率几乎没有变化。我们的研究提供了一种控制初生 Mg2Si 形态和尺寸的简单方法,这将激发开发具有改进机械性能的新型 Al-Mg-Si 合金。
It is found that Li2Sb compound can act as the nucleus of primary Mg2Si during solidification, by which the particle size of primary Mg2Si decreased from ~300 to ~15–25 μm. Owing to the synergistic effect of the Li2Sb nucleus and adsorption-poisoning of Li atoms, the effect of complex modification of Li-Sb on primary Mg2Si was better than that of single modification of Li or Sb. When Li-Sb content increased from 0 to 0.2 and further to 0.5 wt.%, coarse dendrite changed to defective truncated octahedron and finally to perfect truncated octahedral shape. With the addition of Li and Sb, ultimate compression strength (UCS) of Al-20Mg2Si alloys increased from ~283 to ~341 MPa and the yield strength (YS) at 0.2% offset increased from ~112 to ~179 MPa while almost no change was seen in the uniform elongation. Our study offers a simple method to control the morphology and size of primary Mg2Si, which will inspire developing new Al-Mg-Si alloys with improved mechanical properties.
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