The effect of Sb addition on microstructures and tensile properties of extruded Al–20Mg2Si–4Cu alloy
The effect of Sb addition on microstructures and tensile properties of extruded Al–20Mg2Si–4Cu alloy
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Sb添加对挤压Al-20Mg2Si-4Cu合金显微组织和拉伸性能的影响
DOI：
10.1016/j.msea.2016.01.063
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
Qi–Chuan Jiang
中科院分区：
文献类型：
--
作者：
Hui–Yuan Wang;Feng Liu;Lei Chen;Min Zha;Guo–Jun Liu;Qi–Chuan Jiang
研究了挤压态Al-20 Mg 2Si-4Cu合金在室温和高温下的显微组织和力学性能之间的关系。采用金相、场发射扫描电子显微镜、差热分析和扫描电子显微镜等技术对合金的显微组织、拉伸行为和断裂机制进行了表征。结果发现，0.5wt%的Sb添加剂通过将初生Mg 2Si的形态从粗枝晶改变为平均尺寸小于20 µm的较小多面体形状，在细化显微组织方面非常有效。拉伸试验表明，改性后合金的室温和150 °C抗拉强度分别为283 MPa和213 MPa，明显高于未改性合金的220 MPa和185 MPa。断口分析表明，未改性合金中初生Mg 2Si的颗粒断裂转变为改性合金中颗粒-基体界面脱粘。初生Mg 2Si由粗大枝晶转变为细化的多边形，多边形初生Mg 2Si颗粒均匀分散在合金中，阻碍位错运动，释放应力集中，提高了合金的强度和塑性。建立了拉伸过程的断裂机理示意图。
This work was carried out to investigate the relationship between microstructures and mechanical properties of extruded Al–20Mg2Si–4Cu alloys unmodified and modified with 0.5 wt% Sb addition at room and high temperatures. Various techniques including metallography, field emission scanning electron microscope, differential thermal analysis and scanning electron microscopy were used to characterize the microstructure, tensile behavior and fracture mechanism of the alloys. It was found that 0.5 wt% Sb additions were highly effective in refining microstructures by changing the morphology of primary Mg2Si from coarse dendrite into smaller polyhedral shape with average size less than 20 µm. Tensile test showed that ultimate tensile strength (UTS) of the modified alloy increased dramatically to 283 MPa at room temperature and 213 MPa at 150 °C, evidently higher than the 220 MPa and 185 MPa for the unmodified alloy, respectively. Fracture surface examinations revealed a transition from particle fracture of primary Mg2Si in the unmodified alloy to particle–matrix interface debonding in the modified alloy. The transformation of primary Mg2Si from coarse dendrites to refined polygonal shapes contributes to the enhanced strength and ductility of the modified alloy, since the polygonal primary Mg2Si particles dispersed uniformly in modified alloy, impeding dislocation motions and freeing stress concentrations. A schematic map was established to further elucidate the mechanisms of fracture behavior during stretching process.
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DOI：
10.1016/s0921-5093(99)00732-7
发表时间：
2000-04
影响因子：
6.4
作者：
Junjia Zhang;Z. Fan;Y. Q. Wang;B. Zhou
通讯作者：
Junjia Zhang;Z. Fan;Y. Q. Wang;B. Zhou
影响因子：
8.8
作者：
Xiao-feng Wu;Guan-Gan Zhang;Fu-Fa Wu
通讯作者：
Xiao-feng Wu;Guan-Gan Zhang;Fu-Fa Wu
影响因子：
6.2
作者：
Ke Chen;Zi-quan Li
通讯作者：
Ke Chen;Zi-quan Li
DOI：
10.1016/s1003-6326(09)60306-x
发表时间：
2010-08
影响因子：
4.5
作者：
B. Ren;Zhong-Xia Liu;R. Zhao;T. Zhang;Zhi-yong Liu;Ming-xing Wang;Yong-gang Weng
通讯作者：
B. Ren;Zhong-Xia Liu;R. Zhao;T. Zhang;Zhi-yong Liu;Ming-xing Wang;Yong-gang Weng
影响因子：
6.2
作者：
Y. Zhao;Q. Qin;W. Zhou;Y. Liang
通讯作者：
Y. Zhao;Q. Qin;W. Zhou;Y. Liang