Recrystallization behavior of ECAPed A356 alloy at semi-solid reheating temperature

被引：37
作者：
Moradi, M. [1 ]
Nili-Ahmadabadi, M. [1 ,2 ]
Poorganji, B. [3 ]
Heidarian, B. [1 ]
Parsa, M. H. [1 ]
Furuhara, T. [3 ]
机构：
[1] Univ Tehran, Sch Met & Mat Engn, Tehran, Iran
[2] Univ Tehran, Ctr Excellence High Performance Mat, Tehran, Iran
[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 980, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 16-17期
关键词：
Semi-solid; ECAP; Al (A356); Reheating; Recrystallization and sub-grain growth; EBSD; CHANNEL ANGULAR EXTRUSION; MICROSTRUCTURAL EVOLUTION; ANNEALING BEHAVIOR; BOUNDARY MOBILITY; SUBGRAIN GROWTH; COLD-WORKING; AZ91D ALLOY; SIMULATION; KINETICS; TEXTURE;
D O I：
10.1016/j.msea.2010.03.021
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructural evolution of A356 aluminum alloy during reheating was investigated. In this study, thermomechanical treatment (TMT) method was carried out to produce feed stock for semi-solid forming by using equal channel angular pressing (ECAP) in solid state at ambient temperature. In TMT processes, globular microstructure is obtained by a deformation recrystallization technique followed by partial re-melting. This work is an attempt to study in detail, the mechanism of the formation of globular microstructure of severely deformed Al-7% Si alloy by ECAP during reheating process by using scanning electron microscope (SEM) provided with an electron back scatter detection (EBSD) observation as well as recrystallization kinetics. The results indicated that equal channel angular pressing followed by reheating was an effective method to produce semi-solid ingot for thixoforming. According to the kinetics calculation and experimental results presented in this paper, recrystallization kinetics, which is mainly depended on the intrinsic material properties, amount of strain and heating rate, plays an important role on the grain size of the semi-solid microstructure. (C) 2010 Elsevier B.V. All rights reserved.
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页码：4113 / 4121
页数：9
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