Effects of the addition of Ti powders on the microstructure and mechanical properties of A356 alloy

被引：26
作者：
Liu, Zhiwei [1 ]
Wang, Xiaoming [1 ]
Han, Qingyou [1 ]
Li, Jianguo [2 ]
机构：
[1] Purdue Univ, Dept Mech Engn Technol, W Lafayette, IN 47906 USA
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
来源：
POWDER TECHNOLOGY | 2014年 / 253卷
关键词：
Microstructure; A356; alloy; Ultrasonic vibration; In situ Al3Ti; METAL-MATRIX COMPOSITES; WEAR BEHAVIOR; TENSILE PROPERTIES; FABRICATION; AL3TI; AL;
D O I：
10.1016/j.powtec.2013.12.052
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
In the present research, the effects of the addition of Ti powders on the microstructure, especially the morphology and size of alpha-Al crystals and the mechanical properties of A356 alloy were studied. The experimental process involved that 1.5 wt.% and 3.0 wt.% of Ti powders were added into the molten A356 alloy at 780 degrees C, respectively. In the meantime, high-intensity ultrasonic vibration was introduced into the melt for 5 min for dispersing particles and degassing melt. The microstructures and mechanical properties of samples after T6 heat treatment were investigated, respectively. The results showed that in situ formed Al3Ti particles containing element Si were blocky in morphology, with the size in the range of 2-7 mu m, With the addition of Ti partides, alpha-Al crystals of A356 transferred from long columnar dendrite to roughly spherical in morphology, and the size of which decreased obviously as well. Comparing with A356 alloy, the hardness, tensile strength and elongation of A356/3.0 wt.%Ti improved by 24.7%, 423% and 29.9%, respectively. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：751 / 756
页数：6
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