In situ formed Al3Ti particles in Al alloy matrix and their effects on the microstructure and mechanical properties of 7075 alloy

被引：38

作者：

Liu, Zhiwei ^{[1
]}

Rakita, Milan ^{[1
]}

Wang, Xiaoming ^{[1
]}

Xu, Wilson ^{[1
]}

Han, Qingyou ^{[1
,2
]}

机构：

[1] Purdue Univ, Dept Mech Engn Technol, W Lafayette, IN 47906 USA

[2] Shandong Acad Sci, New Mat Inst, Jinan 250014, Shandong, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH | 2014年 / 29卷 / 12期

关键词：

SOLID TI POWDERS; GRAIN-REFINEMENT; LIQUID AL; COMPOSITES; ALUMINUM; FABRICATION; SYSTEM;

D O I：

10.1557/jmr.2014.123

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

As a promising reinforcement of aluminum alloy, in situ formed Al3Ti particles have attracted more attention in the fabrication of aluminum matrix composites. In our research, in situ Al3Ti/7075 alloy composites were fabricated by adding K2TiF6 salt powders into molten 7075 alloy at 750 degrees C via casting method. The formation of in situ Al3Ti particles and their effects on the microstructure and mechanical properties of 7075 alloy, including hardness, ultimate tensile strength (UTS), and yield strength (YS), were investigated. The results showed that in situ formed Al3Ti particles were rod-like in morphology, with the average length and width of 15 mu m and 5 mu m, respectively. Due to the nucleating effect of Al3Ti particles, alpha-Al crystals of 7075 alloy transferred from dendritic to equiaxed structure in morphology, the size of which decreased obviously as well. Compared with 7075 alloy, the hardness, UTS, and YS of in situ Al3Ti/7075 alloy were improved by 14.3%, 18.1%, and 25.8%, respectively.

引用

页码：1354 / 1361

页数：8

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