MB15-RE镁合金铸坯在半固态温度下的应力-应变曲线测试与特征分析  

Experimental Study and Analysis of Stress-strain Curves for the MB15-RE Magnesium Alloys Casting Billet under the Semisolid Conditions

作　　者：王艳彬[1,2] 门海豹 陈强[1,2] 吴茜[2] 林军[1,2] 朱世凤[1,2] 

机构地区：[1]国防科技工业精密塑性成形研究应用中心,重庆400039 [2]中国兵器工业第五九研究所,重庆400039 [3]北方通用动力集团公司,山西大同037036

出　　处：《精密成形工程》2012年第3期5-9,共5页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金项目(51005217);中国博士后基金(201004806777);重庆博士后基金(渝RC2011013)

摘　　要：研究了MB15-RE镁合金常规铸坯在半固态温度下应力-应变曲线变化的影响要素。通过热模拟实验,发现MB15-RE在560℃的半固态温度下应力-应变曲线均可分为3个阶段:应力上升阶段、应力下降阶段和应力稳定阶段;同时在相同应变速率下,合金温度越高,其应力峰值和稳态应力越低,表明曲线与在半固态温度下试样中固液态比例相关;在相同温度下,应变速率越大,峰值应力越大而稳态应力越小,表明了再结晶比例越高,稳态应力越低。The influence factors on stress-strain curves of the MB15-RE magnesium alloys casting billet under the semi-solid conditions were studied.The results of thermal simulation experiment show,the all stress-strain curves in the semisolid temperature of 560 ℃ can be divided into rise,decline and stabilization stages.And under the constant strain rate,the higher temperature can reduce both the peak and steady-state stresses of MB15-RE,which shows the curves are affected by the ratio of phase of samples.In addition,under the same temperature the higher strain-rate can lead to the greater peak and lower steady-state stresses,which shows the greater ratio of recrystallization can lead to lower stabilization stress.

关 键 词：MB15-RE镁合金 铸坯 半固态 真应力-真应变曲线 

分 类 号：TG146.22[一般工业技术—材料科学与工程]