Acoustic emission inspection of Portevin-Le Chatelier effect and deformation mechanisms of two Mg-Li-Al alloys

被引：10
作者：
Wang, Cong [1 ]
Li, Zhuoqun
Xu, Yongbo
Han, Enhou
机构：
[1] Chinese Acad Sci, Inst Met Res, Environm Corros Ctr, Shenyang 110016, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE | 2007年 / 42卷 / 10期
关键词：
D O I：
10.1007/s10853-006-0167-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, Portevin-Le Chatelier (PLC) effect of LA41 magnesium alloy is reported. With increasing strain rate, both ultimate tensile stresses (sigma(b)) and 0.2% proof (sigma(0.2)) stresses increase, while serrations become less severe. Major acoustic emission (AE) peaks appear at the end of elastic region, and transform to burst type signals in the plastic range. In another alloy containing less Li (LA11), serrations are absent and major AE peak values are considerably lowered. Additionally, PLC effect disappears in LA41 after annealing. The role of twins is discussed in details. Actual causes for AE activity during deformation are also proposed.
引用
收藏
页码：3573 / 3579
页数：7
相关论文
共 28 条
[1]  
*ASM INT, 1989, MET HDB, V17, P278
[2]   Acoustic emission during tensile testing of magnesium AZ alloys [J].
Bohlen, J ;
Chmelík, F ;
Dobron, P ;
Letzig, D ;
Lukác, P ;
Kainer, KU .
JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 378 (1-2) :214-219
[3]   Orientation effects on acoustic emission during tensile deformation of hot rolled magnesium alloy AZ31 [J].
Bohlen, J ;
Chmelík, F ;
Dobron, P ;
Kaiser, F ;
Letzig, D ;
Lukác, P ;
Kainer, KU .
JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 378 (1-2) :207-213
[4]  
Bohlen J, 2002, KOVOVE MATER, V40, P290
[5]  
Carpenter S. H., 1984, J ACOUSTIC EMISSION, V6, P11
[6]   The kinetics of the Portevin-Le Chatelier bands in an Al-5at%Mg alloy [J].
CHIHAB, K ;
ESTRIN, Y ;
KUBIN, LP ;
VERGNOL, J .
SCRIPTA METALLURGICA, 1987, 21 (02) :203-208
[7]  
Chmelik F., 2002, J ACOUST EMISS, V20, P108
[8]   DISLOCATION THEORY OF YIELDING AND STRAIN AGEING OF IRON [J].
COTTRELL, AH ;
BILBY, BA .
PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION A, 1949, 62 (349) :49-62
[9]  
Dobroñ P, 2005, KOVOVE MATER, V43, P193
[10]   MICROPLASTICITY DETECTED BY AN ACOUSTIC TECHNIQUE [J].
FISHER, RM ;
LALLY, JS .
CANADIAN JOURNAL OF PHYSICS, 1967, 45 (2P3) :1147-&
123