CAJ | 학술논문

采用Gleeble?1500热模拟试验机研究Pb-Mg-Al合金在变形温度453~613 K、应变速率0.01~1 s?1条件下的热压缩流变行为,计算应力指数和变形激活能,采用Zener-Hollomon参数法构建合金的高温变形的本构关系,基于Murty准则,建立Pb-Mg-Al合金的加工图.结果表明:Pb-Mg-Al合金为正应变速率敏感材料;该合金的热压缩变形流变应力行为可用双曲正弦函数本构方程和Zener-Hollomon参数来描述,其平均变形激活能为149.5244 kJ/mol;从加工图分析并结合激活能,确定Pb-Mg-Al合金的最优变形温度和应变速率分别为533 K和0.1 s?1.
채용Gleeble?1500열모의시험궤연구Pb-Mg-Al합금재변형온도453~613 K、응변속솔0.01~1 s?1조건하적열압축류변행위,계산응력지수화변형격활능,채용Zener-Hollomon삼수법구건합금적고온변형적본구관계,기우Murty준칙,건립Pb-Mg-Al합금적가공도.결과표명:Pb-Mg-Al합금위정응변속솔민감재료;해합금적열압축변형류변응역행위가용쌍곡정현함수본구방정화Zener-Hollomon삼수래묘술,기평균변형격활능위149.5244 kJ/mol;종가공도분석병결합격활능,학정Pb-Mg-Al합금적최우변형온도화응변속솔분별위533 K화0.1 s?1.
@@@@The flow stress behaviors and the deformation microstructure of hot compressed Pb-Mg-Al alloy were investigated by hot compressive tests on Gleeble?1500 thermo-simulation machine in the temperature range of 453?613 K and strain rates range of 0.01?1 s?1. The stress exponent and deformation activation at elevated temperatures were calculated. The constitutive relationship of the Pb-Mg-Al alloy during hot compression deformation at high temperatures was obtained by introducing Zener-Hollomon parameter. Based on Murty criterion, the processing map for the Pb-Mg-Al alloy was obtained. The results show that Pb-Mg-Al alloy is sensitive to strain rate. The hot deformation behavior can be described by a constitutive equation in hyperbolic sine function and Zener-Hollomon parameter. The average hot deformation activation energy of Pb-Mg-Al alloy is 149.524 4 kJ/mol. The optimal processing parameters derived from processing map and activation energy are 533 K in temperature and 0.1 s?1 in strain rate.