Modification mechanism and tensile property of Al-9Si-0.4Mg-0.1Cu alloy

被引：28

作者：

Chang, Liang ^{[1
]}

Ding, Yuming ^{[1
]}

Guo, Binxu ^{[1
]}

Ding, Jian ^{[1
]}

Xia, Xingchuan ^{[1
]}

Tang, Ying ^{[1
]}

Li, Chong ^{[2
]}

Sun, Xiaomian ^{[3
]}

Guo, Junjie ^{[4
]}

Song, Kaihong ^{[1
]}

Wang, Lisheng ^{[3
]}

Zhou, Kaipeng ^{[4
]}

Chen, Xueguang ^{[1
]}

Liu, Yongchang ^{[2
]}

机构：

[1] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China

[2] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China

[3] CITIC Dicastal Co LTD, Qinhuangdao 066011, Hebei, Peoples R China

[4] Qinhuangdao WKW Automot Parts Co Ltd, Qinhuangdao 066011, Hebei, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2022年 / 184卷

基金：

国家重点研发计划;

关键词：

Al Si Mg-Cu alloy; Modification level; Eutectic Si; Twins; Mechanical properties; EUTECTIC MODIFICATION LEVEL; SR-MODIFICATION; THERMAL-CONDUCTIVITY; GRAIN-REFINEMENT; ALUMINUM-ALLOY; AL-7SI ALLOY; SI ALLOYS; MICROSTRUCTURE; ENTRAPMENT; PREDICTION;

D O I：

10.1016/j.matchar.2021.111693

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, eutectic Si modification grade formula was established and effect of Sr element on modification level and mechanical properties of Al-9Si-0.4Mg-0.1Cu alloy was studied. Thermal analysis, SEM, EPMA and TEM were applied to analyze cooling curves, microstructure and Si twinning of the alloys. The results showed that precision and accuracy of eutectic Si modification grade formula were significantly improved and quantitative evaluation modification level of eutectic Si could be achieved. Modification level of eutectic Si increased first and then decreased with Sr content increasing. Though twin plane re-entrant edge (TPRE) mechanism and impurity induced twinning (IIT) mechanism were effective under certain conditions, they cannot fully explain the modification mechanism of eutectic Si in Al-9Si-0.4Mg-0.1Cu alloy. Sr element caused constitutional undercooling at the front of solid-liquid interface, promoted the formation of fine Al2Si2Sr phases and nano-precipitates, resulting in the changes of size and morphology of eutectic Si. With the improvement of eutectic Si modification level, the UTS and El of the alloys increased. While, adding excessive Sr led to the formation of coarse Al2Si2Sr, which was detrimental to the improvement of modification level and mechanical properties of alloy.

引用

页数：11

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