Effect of nano-particles on the creep resistance of Mg-Sn based alloys

被引：81
|
作者：
Kang, D. H. [1 ]
Park, S. S. [1 ]
Oh, Yoon S. [1 ]
Kim, Nack J. [1 ]
机构：
[1] Pohang Univ Sci & Technol, Ctr Adv Aerosp Mat, Pohang 790784, Kyungbuk, South Korea
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 449卷
关键词：
nano-particles; Mg-Sn alloy; cooling rate; creep resistance; load-relaxation test;
D O I：
10.1016/j.msea.2006.02.332
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A study has been made on the microstructure and high-temperature properties of die-cast Mg-Sn-Al-Si (TAS831) alloy. Microstructure of TAS831 alloy is characterized by the presence of thermally stable Mg2Sn nano-particles within the matrix. It also contains Mg2Sn and Mg2Si particles along grain boundaries. It has been shown that the morphology of matrix Mg2SB particles varies depending on cooling rate, forming rod-type Mg-2 Sn particles at fast cooling rates and polygonal particles at slow cooling rates. Elevated-temperature creep tests show that the die-cast TAS831 alloy has superior creep resistance compared with commercial AZ91 alloy. Analyses of creep and load relaxation at elevated temperatures in the context of internal-variable theory indicate that the presence of thermally stable nano-particles within the matrix increases the resistance to dislocation movement, thereby improving the creep resistance. (c) 2006 Elsevier B.V All rights reserved.
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页码：318 / 321
页数：4
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