| 添加SiC对不同尺寸AZ91D镁合金坯料半固态组织的影响 |
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| 引用本文： | 李元东,文靖,陈体军,杨建,马颖,姜向东.添加SiC对不同尺寸AZ91D镁合金坯料半固态组织的影响[J].中国有色金属学报,2010,20(3). |
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| 作者姓名： | 李元东 文靖 陈体军 杨建 马颖 姜向东 |
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| 作者单位： | 1. 兰州理工大学,甘肃省有色金属新材料省部共建国家重点实验室,兰州,730050;兰州理工大学,有色金属合金反加工教育部重点实验室,兰州,730050
2. 兰州理工大学,甘肃省有色金属新材料省部共建国家重点实验室,兰州,730050 |
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| 基金项目： | 国家重点基础发展计划资助项目，兰州理工大学博士科研启动基金 |
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| 摘 要： | AZ91D镁合金经重熔加入0.3%(质量分数)SiC细化后浇注成不同尺寸(直径)的锭料。研究SiC对不同尺寸AZ91D镁合金坯料半固态等温热处理组织的影响。结果表明:未经SiC细化处理AZ91D镁合金的半固态组织存在明显的尺寸效应,从心部到边缘,固相颗粒尺寸由大逐渐变小,如d70mm试样内的固相颗粒尺寸从心部的150μm变为边缘的110μm,并趋于圆整,液相逐渐增多;随着坯料尺寸的增加,由心部到边缘的组织差异进一步加大。SiC细化的AZ91D镁合金坯料经半固态等温热处理后,其组织中的固相颗粒尺寸整体变得细小,d70mm试样内的固相颗粒均不大于80μm,边缘和心部的固相颗粒尺寸变得很相近,在70μm与80μm之间,球化圆整且分布均匀;经SiC处理的半固态压铸件中,气孔等缺陷明显减少。
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| 关 键 词： | 镁合金 SiC颗粒 半固态等温热处理 尺寸效应 晶粒细化 |
Effects of SiC addition on microstructure of AZ91D alloy initial billet with various size during semisolid isothermal treatment |
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| LI Yuan-dong,WEN Jing,CHEN Ti-jun,YANG Jian,MA Ying,JIANG Xiang-dong.Effects of SiC addition on microstructure of AZ91D alloy initial billet with various size during semisolid isothermal treatment[J].The Chinese Journal of Nonferrous Metals,2010,20(3). |
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| Authors: | LI Yuan-dong WEN Jing CHEN Ti-jun YANG Jian MA Ying JIANG Xiang-dong |
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| Affiliation: | LI Yuan-dong1,2,WEN Jing1,CHEN Ti-jun1,YANG Jian1,MA Ying1,JIANG Xiang-dong1 (1.State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China,2.Key Laboratory of Non-ferrous Metal Alloys , Processing,Ministry of Education,China) |
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| Abstract: | AZ91D magnesium alloy was remelted;then,0.3%(mass fraction) SiC particles as grain refiner were introduced into the melt;and finally,the melt was poured into cavities with different diameters to form ingots.Those ingots were cut into some billets with determined diameters,and heated to semisolid temperature.The effect of SiC addition on microstructure of mutative-size AZ91D initial billet during semisolid isothermal heat treatment was studied.The results show that there is an obvious dimensional effect on m... |
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| Keywords: | magnesium alloy SiC particle semisolid isothermal heat treatment dimensional effect grain refinement |
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