镁合金与铝合金压铸过程中型腔内压力的变化特性  

COMPARATIVE STUDY OF THE CAVITY PRESSURE OF MAGNESIUM ALLOY AND ALUMINIUM ALLOY DURING DIE CASTING PROCESS

作　　者：刘文辉[1] 刘艳改[1] 熊守美[1] 柳百成[1] Y.Matsumoto M.Murakami 

机构地区：[1]清华大学机械工程系,北京100084 [2]Toyo Machinery & Metal Co.,Ltd.,Hyogo-ken,Japan,674-0091

出　　处：《金属学报》2005年第1期103-107,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50275081"清华-东洋镁铝合金成形技术研究开发中心"研究开发项目清华大学校内基金以及教育部专项基金资助~~

摘　　要：对相同压铸条件下ADC12铝合金和AZ91D镁合金铸件型腔内的压力变化进行了比较研究.从高温液态到低温固态,铝、镁合金的压力曲线可划分为6个区,在实验分析结果的基础上定义了相应的特性参数.压铸充型过程中两种合金的充填压力和充填时间基本一致,压力曲线变化趋势也一致.压力曲线测试结果表明,铝合金的保压时间和有效压力保持时间远远高于镁合金.对于不同测试点的最大增压压力, ADC12铝合金比较接近, AZ91D镁合金相差较大.金属液凝固特性及合金力学性能的不同决定了两种合金压力益线的差异.The pressure changes in the cavity of ADC12 and AZ91D die castings under the same processing technology have been measured. From liquid phase to solid phase, the pressure curves of ADC12 and AZ91D are divided into six sections and the characteristic parameters were defined based on the experimental results. The results show that the filling pressure and filling time as well as the trend of pressure change of these two alloys are almost the same. The pressure holding time and the effective holding time of the transferred pressure of ADC12 are much higher than those of AZ91D. For different measured points, the maximum transferred pressures of ADC12 are close to each other and those of AZ91D show a great difference. The difference of pressure curves between the two alloys is related to the solidification characteristic of the liquid metal and the mechanical properties of the alloys.

关 键 词：镁合金 铝合金 压铸 型腔内压力 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG136.1[金属学及工艺—金属材料]