The microstructure of Mg-4Zn-2Al-0.5Ca aged alloy

被引：5
作者：
Lin, Xiaoping [1 ]
Dong, Yun [1 ]
Ye, He [1 ]
Song, Boyang [2 ]
机构：
[1] Northeast Univ, Sch Met & Mat, Shenyang 110819, Peoples R China
[2] Univ Michigan Ann Arbor, Ann Arbor, MI USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 538卷
基金：
中国国家自然科学基金;
关键词：
Cellular texture; Ordered zone; Disc-like precipitate; Moire fringe; MG-ZN ALLOY; MECHANICAL-PROPERTIES; AL ADDITION;
D O I：
10.1016/j.msea.2012.01.035
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, we investigated the microstructure of a new Mg-4Zn-2Al-0.5Ca aged alloy with TEM and HRTEM. The age hardening process of Mg-4Zn-2Al-0.5Ca alloy aged at 120 degrees C or 160 degrees C follows a similar pattern: a period of fluctuation of hardness present before the alloy reaches its maximum hardness. The atomic arrangement is different in different areas of the microstructure possibly due to the difference of the segregated degree of the solute atoms in the alloy. The microstructure of alloy aged at 120 degrees C for 230 h consists of cellular textures, ordered zone, elongated precipitates and disc-like precipitates, while the microstructure of the alloy aged at 160 degrees C for 32 h consists of edge dislocations, ordered zones and moire fringe. No MgZn precipitates are found in the peak aged microstructures of alloys aged at 120 degrees C and 160 degrees C. It is reasonable to believe that Ca is a particularly effective trace addition in improving the thermal stability of precipitation in Mg-4Zn-2Al alloy aged at 120 degrees C and 160 degrees C. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：231 / 235
页数：5
相关论文
共 14 条
[1]   The effect of micro-alloying addition of Cr on age hardening of an Mg-Zn alloy [J].
Buha, J. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 492 (1-2) :293-299
[2]   Reduced temperature (22-100°C) ageing of an Mg-Zn alloy [J].
Buha, J. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 492 (1-2) :11-19
[3]   Mechanical properties of naturally aged Mg-Zn-Cu-Mn alloy [J].
Buha, J. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 489 (1-2) :127-137
[4]   The effect of Ba on the microstructure and age hardening of an Mg-Zn alloy [J].
Buha, J. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 491 (1-2) :70-79
[5]   Characterisation of precipitates in an aged Mg-Zn-Ti alloy [J].
Buha, J. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 472 (1-2) :171-177
[6]  
Chen J Q, 2008, MAT REV, V22, P342
[7]  
Ding W J, 2007, SCI TECHNOLOGY MAGNE, P1
[8]   Characterization of strengthening precipitate phases in a Mg-Zn alloy [J].
Gao, X. ;
Nie, J. F. .
SCRIPTA MATERIALIA, 2007, 56 (08) :645-648
[9]   Microstructure and mechanical properties of Mg-4.0Zn-0.5Ca alloy [J].
Geng, L. ;
Zhang, B. P. ;
Li, A. B. ;
Dong, C. C. .
MATERIALS LETTERS, 2009, 63 (05) :557-559
[10]   Enhanced precipitation hardening of Mg-Ca alloy by Al addition [J].
Jayaraj, J. ;
Mendis, C. L. ;
Ohkubo, T. ;
Oh-ishi, K. ;
Hono, K. .
SCRIPTA MATERIALIA, 2010, 63 (08) :831-834
12