摘要
将Si添加到AZ31熔体制备AZ31-2%Si合金,采用高温多次闭模压缩加工AZ31和AZ31-2%Si合金,研究其微观组织和耐磨性能。结果表明,铸态AZ31合金相组成为Mg与Mg_(17)Al_(12),而铸态AZ31-2%Si合金相组成为Mg、Mg_(17)Al_(12)与Mg_(2)Si。400℃五次压缩后,AZ31合金晶粒由粗大等轴晶转变为细小再结晶,Mg_(17)Al_(12)相溶解,AZ31-2%Si合金中Mg_(17)Al_(12)相绝大部分溶解到基体中,粗大Mg_(2)Si相破碎成细小的颗粒并弥散分布在晶界周围。滑动摩擦2500 m后,铸态、五次压缩态AZ31合金的磨损量分别为26.4、22.1 mg,铸态、五次压缩态AZ31-2%Si合金的磨损量分别为22.7、21.0 mg,AZ31合金耐磨性能提高的主要因素是晶粒细化,AZ31-2%Si合金耐磨性能提高的主要因素是晶粒细化、Mg_(2)Si相细化及其弥散分布。
AZ31-2%Si alloy was prepared by adding Si to the AZ31 melt.AZ31 and AZ31-2%Si alloy were processed by multi-cycle closed die compression at high temperature,and the microstructure and wear resistance were studied.The results show that the as-cast AZ31 alloy is composed of Mg and Mg_(17)Al_(12),while the as-cast AZ31-2%Si alloy is composed of Mg,Mg_(17)Al_(12)and Mg_(2)Si.After five cycles compression at 400℃,grain of the AZ31 alloy is transformed from coarse equiaxed grain to fine recrystallized grain and Mg_(17)Al_(12)phase is dissolved,and the vast majority of Mg_(17)Al_(12)phase in the AZ31-2%Si alloy is dissolved into the matrix,the coarse Mg_(2)Si phase is broken into fine particles and dispersed around grain boundaries.After sliding friction for 2500 m,the wear loss of the as-cast and five cycles compressed AZ31 alloy is 26.4 mg and 22.1 mg,respectively.The wear loss of the as-cast and five cycles compressed AZ31-2%Si alloy is 22.7 mg and 21.0 mg,respectively.The main factor for improving of wear resistance of the AZ31 alloy after compression is grain refinement.The main factors for improving of wear resistance of the AZ31-2%Si alloy after compression are grain refinement,Mg_(2)Si phase refinement and its dispersive distribution.
作者
郭炜
管博
陈威
吴丹
Guo Wei;Guan Bo;Chen Wei;Wu Dan(Jiangxi Key Laboratory of Advanced Copper-based Materials,Institute of Applied Physics,Jiangxi Academy of Sciences,Nanchang Jiangxi 330096,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第5期36-39,共4页
Heat Treatment of Metals
基金
江西省科学院省级科技计划包干制项目(2021YSBG22007)。
关键词
镁合金
闭模压缩
微观组织
Mg2
Si相
耐磨性
Mg alloy
closed die compression
microstructure
Mg2 Si phase
wear resistance
作者简介
郭炜(1981—),男,副研究员,博士,主要研究方向为有色金属塑性加工,E-mail:guowei66@sohu.com。
