<strong>RAP</strong>法制备<strong>AlSi7Mg</strong>合金半固态坯料研究

doi:10.11900/0412.1961.2020.00254

金属学报

2021, Vol. 57

Issue (6): 703-716 DOI: 10.11900/0412.1961.2020.00254

研究论文

本期目录 | 过刊浏览

RAP法制备AlSi7Mg合金半固态坯料研究

姜巨福¹(

), 张逸浩¹, 刘英泽¹, 王迎², 肖冠菲¹, 张颖¹

^1.哈尔滨工业大学材料科学与工程学院哈尔滨 150001
^2.哈尔滨工业大学机电工程学院哈尔滨 150001

Research on AlSi7Mg Alloy Semi-Solid Billet Fabricated by RAP

JIANG Jufu¹(

), ZHANG Yihao¹, LIU Yingze¹, WANG Ying², XIAO Guanfei¹, ZHANG Ying¹

^1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
^2.School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China

引用本文:

姜巨福, 张逸浩, 刘英泽, 王迎, 肖冠菲, 张颖. RAP法制备AlSi7Mg合金半固态坯料研究[J]. 金属学报, 2021, 57(6): 703-716.
Jufu JIANG, Yihao ZHANG, Yingze LIU, Ying WANG, Guanfei XIAO, Ying ZHANG. Research on AlSi7Mg Alloy Semi-Solid Billet Fabricated by RAP[J]. Acta Metall Sin, 2021, 57(6): 703-716.

全文: PDF(46624 KB) HTML

摘要:

采用DSC测试、热镦粗实验、半固态等温处理实验、金相显微镜观察以及Image Pro Plus图像处理软件，研究了等温压缩温度、压缩量和半固态等温处理的温度、保温时间对再结晶重熔(RAP)法制备AlSi7Mg铝合金半固态坯料微观组织的影响。结果表明：等温压缩过程中温度对半固态坯料微观组织的影响不明显，而等温压缩变形量的增大有利于细化半固态坯料微观组织，最优热镦粗参数为温度240℃，变形量40%；半固态等温处理过程中，随保温温度升高，微观组织固相晶粒的尺寸逐渐增大，而随着保温时间延长，半固态组织中固相颗粒的尺寸先缓慢长大再迅速长大然后趋于不变，固相颗粒的圆整度变化较为复杂。通过RAP法制备的AlSi7Mg铝合金半固态坯料平均晶粒尺寸为64~117 μm，形状因子为0.76~0.89。低于599℃时，半固态的平均晶粒尺寸的立方粗化线性关系不明显，影响晶粒粗化的机制主要有Ostwald熟化、合并长大、再结晶和熔化；在599℃时，晶粒尺寸的立方粗化线性关系较为明显，此时Ostwald熟化为晶粒粗化的主导机制。

关键词 ：材料合成与加工工艺, 半固态坯料, 再结晶重熔, 微观组织, AlSi7Mg

Abstract：

Semi-solid metal processing is a metal-forming technology that combines the advantages of casting and forging, realizing near-net forming high-performance parts with complex structures. Research on semi-solid processing of AlSi7Mg alloys mainly focuses on rheology, and the preparation of high solid fraction AlSi7Mg semi-solid billets by the solid phase method has been largely neglected. In fact, semi-solid technology is more significant than casting at higher solid fractions. The present study investigates semi-solid billets of AlSi7Mg aluminum alloy with a high solid fraction, prepared by the recrystallization and partial re-melting (RAP) method. The effects of upsetting temperature, compression ratio, semi-solid isothermal treatment temperature, and holding time on the billet microstructure were investigated by DSC test, upsetting experiment, semi-solid isothermal treatment experiment, OM observations, and Image Pro Plus image processing software. The microstructure of the semi-solid billet during isothermal compression was slightly affected by temperature but was beneficially refined by increasing the compression ratio. The optimal hot upsetting parameters were 240^oC and 40% deformation. During the semi-solid isothermal treatment, increasing the holding temperature gradually increased the size of the solid phase grains in the microstructure. As the holding time increased, the solid phase particles in the semi-solid structure initially grew slowly, and thereafter rapidly grew to a stable size. The changes in roundness of the solid particles were more complicated. The average grain size of the billet prepared by the RAP method was 64~117 μm, and the shape factor was 0.76~0.89. The linear relationship between cubic coarsening of the average semi-solid grain size and isothermal time was nonobvious at isothermal temperatures below 599^oC but was evident at temperatures of 599^oC. Below 599^oC, the grain coarsening is affected by Ostwald ripening, coalescence, recrystallization, and melting; while at 599^oC, the grain coarsening was dominated by Ostwald ripening.

Key words： synthesizing and processing technics for material semi-solid billet recrystallization and remelting microstructure AlSi7Mg

收稿日期: 2020-07-13

ZTFLH:

TG249.9

基金资助:国家重点研发计划项目(2019YFB2006500);国家自然科学基金项目(51875124)

作者简介: 姜巨福，男，1976年生，教授，博士

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表1 AlSi7Mg铝合金成分 (mass fraction / %)

图1 AlSi7Mg铝合金DSC曲线及其液相率-温度曲线

图2 不同变形量下AlSi7Mg铝合金的镦粗试样

图3 不同变形温度和变形量对AlSi7Mg铝合金半固态坯料的影响(a) average grain size (D)(b) shape factor (f)

图4 变形量为40%时不同变形温度下AlSi7Mg铝合金半固态坯料微观组织的OM像(a) 200oC (b) 220oC (c) 240oC (d) 260oC

图5 变形量为30%不同变形温度下AlSi7Mg铝合金半固态坯料微观组织的OM像(a) 200oC (b) 220oC (c) 240oC (d) 260oC

图6 变形量为20%不同变形温度下AlSi7Mg铝合金半固态坯料微观组织的OM像(a) 200oC (b) 220oC (c) 240oC (d) 260oC

图7 不同等温时间下AlSi7Mg铝合金半固态坯料微观组织的OM像(T = 581℃)(a) 2 min (b) 6 min (c) 11 min (d) 16 min (e) 21 min (f) 26 min

图8 不同等温时间下AlSi7Mg铝合金半固态坯料微观组织的OM像(T = 584℃)(a) 2 min (b) 6 min (c) 11 min (d) 16 min (e) 21 min (f) 26 min

图9 不同等温时间下AlSi7Mg铝合金微观组织的OM像(T = 588℃)(a) 2 min (b) 6 min (c) 11 min (d) 16 min (e) 21 min (f) 26 min

图10 不同等温时间下AlSi7Mg铝合金微观组织的OM像(T = 593℃)(a) 2 min (b) 6 min (c) 11 min (d) 16 min (e) 21 min (f) 26 min

图11 不同等温时间下AlSi7Mg铝合金微观组织的OM像(T = 599℃)(a) 2 min (b) 6 min (c) 11 min (d) 16 min (e) 21 min (f) 26 min

图12 平均晶粒尺寸D3随等温时间变化的散点图及线性拟合图

图13 不同等温时间组的平均晶粒尺寸及形状因子随等温温度变化图

图14 等温时间为11 min时平均晶粒尺寸及形状因子随等温温度变化图

图15 不同方法制备的AlSi7Mg铝合金半固态坯料微观组织对比

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