Effects of SIMA （Strain Induced Melt Activated Processing） Parameters on Microstructure and Composition Segregation of Semi-solid 5083 Aluminum Alloy

Xiao Wenhua; Liu Yunzhong; Liu Qiulin; Li Fengxian

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Effects of SIMA （Strain Induced Melt Activated Processing） Parameters on Microstructure and Composition Segregation of Semi-solid 5083 Aluminum Alloy
Vol. 30, Issue 9, Pages: 823-826(2010)
Published： 2010 ，
DOI：

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[1]肖文华,刘允中,刘丘林,李凤仙.SIMA法工艺参数对半固态5083合金组织及成分偏析的影响[J].特种铸造及有色合金,2010,30(09):823-826+779-780.

Xiao Wenhua, Liu Yunzhong, Liu Qiulin, et al. Effects of SIMA （Strain Induced Melt Activated Processing） Parameters on Microstructure and Composition Segregation of Semi-solid 5083 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 30(9):823-826(2010)
[1]肖文华,刘允中,刘丘林,李凤仙.SIMA法工艺参数对半固态5083合金组织及成分偏析的影响[J].特种铸造及有色合金,2010,30(09):823-826+779-780. DOI：

Xiao Wenhua, Liu Yunzhong, Liu Qiulin, et al. Effects of SIMA （Strain Induced Melt Activated Processing） Parameters on Microstructure and Composition Segregation of Semi-solid 5083 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 30(9):823-826(2010) DOI：

摘要

采用大挤压比热挤压为预变形方式的SIMA法制备了5083铝合金半固态坯料

研究了挤压比、等温热处理温度与保温时间等工艺参数对半固态坯料微观组织演变的影响

并通过SEM和能谱线扫描分析了等温热处理温度对5083铝合金主要元素成分偏析的影响规律。结果表明

SIMA法制备5083铝合金半固态坯料的微观组织受工艺参数影响较大

当挤压比为17.36

等温温度为605～610℃

保温时间为15～20min时

可以获得较理想的5083半固态坯料。另外

5083铝合金中Mn元素的分布基本不受等温热处理温度影响

但Al、Mg元素的分布受温度影响较大

等温温度越高

偏析越严重;在晶界处偏析的低熔点相主要由Mg元素构成。

Abstract

Semi-solid 5083 aluminum alloy billets were prepared by SIMA with hot extrusion at high extrusion ratio for pre-deformation. Effects of some processing parameters

such as extrusion ratio

isothermal temperature and holding time

on microstructure evolution of the semi-solid alloy billets were investigated

and influences of isothermal temperature on the segregation of dominant elements in the alloy billets were observed by SEM （scanning electron microscope） and EDS. The results indicate that microstructure evolution of the semi-solid alloy billets prepared by SIMA is closely related to the processing parameters. Desirable semi-solid 5083 alloy billets can be obtained with the extrusion ratio of 17.3 at 605℃ for 15

0 min. Distribution of the Mn element in the alloy is independent of the isothermal temperature

however

distribution of Al

Mg element are dependent on the temperature

where segregation is more and more serious with increasing in isothermal temperature. Low point phase segregated from the grain boundary is mainly composed of Mg element.