The influences of Sr on the microstructure and mechanical properties of Mg-5Zn-2Al alloy

被引：27
作者：
Chen, Yu'an [1 ,2 ]
Gao, Junjie [1 ]
Song, Yu [1 ]
Wang, Yi [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 671卷
关键词：
Sr addition; Microstructure; Mechanical properties; Extrusion; Mg-Zn-Al alloy; MAGNESIUM ALLOYS; GRAIN-REFINEMENT; CREEP-BEHAVIOR; AL-ALLOY; CAST; MN; TEMPERATURE; HOMOGENEITY; EXTRUSION; TEXTURE;
D O I：
10.1016/j.msea.2016.06.033
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of Sr on the microstructure and mechanical properties of Mg-5Zn-2Al alloy are studied. The results indicate that the as-cast ZA52 alloy mainly consists of alpha-Mg matrix, tau-Mg-32(Al, Zn)(49) and MgZn phases. Sr addition results in the precipitation of Al4Sr and suppression of MgZn phase. In high Sr-containing alloys, the Mg5Zn2Al2 phase can also be observed. Both the dendrite and grain size of the alloys can be refined by 1.0% Sr addition. However, the 0.2% Sr addition results in the grain coarsening in the alloy due to the decrease of contribution of Al and Zn solutes on the grain refinement. Both extrusion process and Sr addition give a response in refined microstructure. The yield strength and ultimate tensile strength of extruded alloys are increased, respectively, by about 167 MPa and 135 MPa in compared with the as-cast state. The elongations to failure enhanced by about 1 time, reaches 9.9-16.5%, with a strength of 322-338 MPa. Go along with Sr increase, yield strength increases and elongation decreases gradually in as-extruded alloy. The elongation of all the alloys decreases rapidly when Sr content exceeds 0.5% due to the formation of MgsZn(2)Al(2) phase. (C) 2016 Elsevier B.V. All rights reserved.
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页码：127 / 134
页数：8
相关论文
共 35 条
[1]   Microstructural homogeneity, texture, tensile and shear behavior of AM60 magnesium alloy produced by extrusion and equal channel angular pressing [J].
Akbaripanah, F. ;
Fereshteh-Saniee, F. ;
Mahmudi, R. ;
Kim, H. K. .
MATERIALS & DESIGN, 2013, 43 :31-39
[2]  
Baril E., 2003, J MINER MET MAT SOC
[3]  
Borkar H., 2014, MAT SCI ENG A-STRUCT, V549, P168
[4]   Effect of extrusion temperature on texture evolution and recrystallization in extruded Mg-1% Mn and Mg-1% Mn-1.6% Sr alloys [J].
Borkar, Hemant ;
Gauvin, Raynald ;
Pekguleryuz, Mihriban .
JOURNAL OF ALLOYS AND COMPOUNDS, 2013, 555 :219-224
[5]   Microstructural investigation and the creep behavior of Mg-Sr-Mn alloys [J].
Celikin, M. ;
Kaya, A. A. ;
Pekguleryuz, M. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2012, 550 :39-50
[6]   A model of grain refinement incorporating alloy constitution and potency of heterogeneous nucleant particles [J].
Easton, MA ;
StJohn, DH .
ACTA MATERIALIA, 2001, 49 (10) :1867-1878
[7]   Determination of three-dimensional grain size distribution by linear intercept measurement [J].
Han, JW ;
Kim, DY .
ACTA MATERIALIA, 1998, 46 (06) :2021-2028
[8]   The effect of strontium in plasticity of magnesium alloys [J].
Hazeli, K. ;
Sadeghi, A. ;
Pekguleryuz, M. O. ;
Kontsos, A. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2013, 578 :383-393
[9]   The role of solute in grain refinement of magnesium [J].
Lee, YC ;
Dahle, AK ;
StJohn, DH .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2000, 31 (11) :2895-2906
[10]   Investigation on the impression creep properties of a cast Mg-6Al-1Zn magnesium alloy [J].
Mazraeshahi, E. Mohammadi ;
Nami, B. ;
Miresmaeili, S. M. .
MATERIALS & DESIGN, 2013, 51 :427-431
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