半固态挤压高硅铝合金二次加热的微观组织演变

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英文篇名：Microstructure Evolution of an Extruded High Silicon Semi-solid State Aluminum Alloys During Reheating 作者：陈志国 ; 方亮 ; 吴吉文 ; 张海筹 ; 马文静 ; 白月龙 英文作者：CHEN Zhiguo;FANG Liang;WU Jiwen;ZHANG Haichou;MA Wenjing;BAI Yuelong;School of Energy and Electromechanical Engineering,Hunan University of Humanities Science and Technology;School of Materials Science and Engineering,Central South University;General Research Institute for Nonferrous Metals;Hunan Wenchang Technology Company Limited; 关键词：挤压态 ; 高硅铝合金 ; 二次加热功率 ; 二次加热温度 英文关键词：extrusion;;high-silicon aluminum alloys;;reheating power;;reheating temperature 中文刊名：CLDB 英文刊名：Materials Reports 机构：湖南人文科技学院能源与机电工程学院;中南大学材料科学与工程学院;北京有色金属研究总院;湖南文昌科技有限公司; 出版日期：2019-03-25 出版单位：材料导报 年：2019 期：v.33 基金：湖南省双一流学科建设项目;; 湖南省娄底市科技计划项目(2016ZD05)~~ 语种：中文; 页：CLDB201906019 页数：5 CN：06 ISSN：50-1078/TB 分类号：93-97

摘要

本实验研究了半固态挤压高硅铝合金二次加热微观组织演变规律,以获得具有细小、近球状晶粒的组织。研究结果表明,二次加热功率和二次加热温度是影响二次加热过程的两大主要因素,随加热功率的增加,坯料心部和边部的组织差异变大,而随二次加热温度的升高,细小、不规则的晶粒逐渐长大并呈现出球化趋势。分析各工艺下的微观组织,得到适合于触变成形的二次加热工艺为:加热功率7 kW、加热温度530℃。此条件下获得的平均晶粒直径为35.2μm,抗拉强度为418.5 MPa。
        The present work aimed to investigate the rule of reheating an extruded high silicon aluminum alloy into semi-solid state,so as to obtain a near globular microstructure. The results showed that reheating power and reheating temperature are two key parameters which affect considerably the reheating process. The increase of heating power can magnify the difference of microstructure for core and edge parts of billets. And with the increase of reheating temperature,the fine and irregular grains grow gradually and spheroidizes. The optimum reheating process parameters suitable for thixoforming were determined to be 7 k W( power) and 530 ℃( temperature),by analyzing the microstructure for different process.Under this processing condition,the average grain diameter of the resultant specimen experienced reheating was 35. 2 μm and the ultimate strength was 418. 5 MPa.

引文

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