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AZ31B镁合金应变诱发半固态组织观察
引用本文:吉泽升,杉山澄雄,柳本润. AZ31B镁合金应变诱发半固态组织观察[J]. 哈尔滨理工大学学报, 2009, 14(1): 67-71
作者姓名:吉泽升  杉山澄雄  柳本润
作者单位:哈尔滨理工大学,材料科学与工程学院,黑龙江,哈尔滨,150040;东京大学,生产技术研究所,日本,东京,153-8505
基金项目:黑龙江省科技攻关项目 
摘    要:采用AZ31B镁合金挤出材,在573K进行28%-30%预变形加工,然后在863—893K经过不同保温时间进行等温球化处理,观察了试样不同区域的组织,考察了温度及保温时间对组织的影响,得到了具有圆整固相颗粒的半固态组织.实验结果表明:适当提高球化处理温度,有利于加速球化过程,以获得细小圆整半固态组织;延长保温时间固相分数降低,但幅度不大,并发生颗粒不规则化;在同一个试样上,由于部位不同,变形程度不同,所得半固态材料的固相率不同.讨论了半固态组织的形成机理,分析认为预变形后,半固态组织形成过程包括再结晶、晶粒长大阶段,受溶质、空位扩散控制的半固态组织形成阶段,受液-固界面张力作用的固相颗粒圆整化阶段.开始形成半固态组织阶段,扩散占主导地位,在进一步球化过程中,界面张力占主导地位.

关 键 词:AZ31B镁合金  应变诱发  半固态组织  机理

Microstructure of Semi-solid AZ31B Magnesium Alloy Through Strain-induced Meltactivation Method
JI Ze-sheng,SUGIYAMA Sumio,YANAGIMOYO Jun. Microstructure of Semi-solid AZ31B Magnesium Alloy Through Strain-induced Meltactivation Method[J]. Journal of Harbin University of Science and Technology, 2009, 14(1): 67-71
Authors:JI Ze-sheng  SUGIYAMA Sumio  YANAGIMOYO Jun
Affiliation:1.School of Material Science and Engineering;Harbin University of Science and Technology;Harbin 150040;China;2.Institute of Industry Science;The University of Tokyo;Tokyo 153-8505;Japan
Abstract:A semi-solid microstructure of AZ31B magnesium alloy containing spherical solid particles was studied.This material was subjected to a series of spheroidizing treatments for various holding times at 863~893K after being compressed by 28%~30% in length at 573K.The effects of heating temperature and holding time on microstructures were studied.It was found that increasing the heating temperature could accelerate the spheroidizing process,resulting in small spherical semi-solid microstructures.With a longer ho...
Keywords:AZ31B magnesium alloy  strain-induced meltactivation method  semisolid microstructure  mechanism  
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