Microstructure and Mechanical Properties of A356 Aluminum Alloy Prepared by Casting Combined with Back Extrusion
Microstructure and Mechanical Properties of A356 Aluminum Alloy Prepared by Casting Combined with Back Extrusion
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铸造结合反挤压制备A356铝合金的显微组织和力学性能
DOI：
10.1134/s0031918x20020106
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发表时间：
2020-02
影响因子：
1.2
通讯作者：
Qi Zhang
中科院分区：
文献类型：
--
作者：
Zhenglong Liang;Qi Zhang
研究了采用铸造与反挤压复合成形工艺制备的A356铝合金的显微组织和力学性能。在490 ~ 540℃的不同进料速率下，通过反挤压引起剧烈的塑性变形，改善铸件组织。在原铸件样品中发现了许多缩孔。根据本文的实验结果，该组合工艺可以显著消除收缩孔隙率。在有效应变大于1.8的区域，片状或长条形Si颗粒和初生铸造枝晶明显细化。在冲头下方区域发生了剧烈的塑性变形，同时实现了组织细化。由于动态恢复引起的软化行为，变形区的屈服强度和抗压强度随着进料速率的增加而逐渐降低，而未变形区的屈服强度和抗压强度随着压力的增加而逐渐升高。
In this paper, the microstructure and mechanical properties of A356 aluminum alloy prepared by the combined forming process of casting and back extrusion are investigated. The back extrusion was employed to induce severe plastic deformation for improving the casting microstructures at temperatures ranging from 490 to 540 degrees C with different feed rates. Many shrinkage porosities were found in the original casting samples. According to the experiments carried out in this paper, the combined process could significantly eliminate the shrinkage porosities. The plate-like or long strip-like Si particles and the primary casting dendrites could be obviously refined at the region where the effective strain is larger than 1.8. The severe plastic deformation could be induced at the region under the punch, where the microstructure refining was achieved at the same time. Due to the softening behavior caused by dynamic recovery, the yield strength and compressive strength of the deformed area gradually decreased with the feed rate, while they increased as the pressure gradually increased at the undeformed region.
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影响因子：
8.4
作者：
R. Immanuel;S. Panigrahi
通讯作者：
R. Immanuel;S. Panigrahi
影响因子：
6.3
作者：
H. R. Kim;M. Seo;W. Bae
通讯作者：
H. R. Kim;M. Seo;W. Bae
DOI：
10.1016/j.msea.2014.05.088
发表时间：
2014-06
影响因子：
6.4
作者：
M. Roy;D. Maijer
通讯作者：
M. Roy;D. Maijer
影响因子：
3.2
作者：
L. Colley
通讯作者：
L. Colley
T6热处理对变质A356合金显微组织、拉伸性能和断裂行为的影响
DOI：
10.1016/j.matdes.2011.11.018
发表时间：
2012-04
期刊：
Materials & Design
影响因子：
--
作者：
坚增运
通讯作者：
坚增运