CAJ | 학술논문

采用 Gleeble?1500热/力模拟试验机研究 Al?3Cu?0.5Sc 合金在温度为350~500°C、应变速率为0.01~10 s?1条件下的高温压缩变形行为。利用经摩擦修正和温度补偿修正后的流变应力曲线建立合金的本构方程，温度和应变速率对变形行为的影响可使用包含Zener-Holloman参数的指数方程来描述。通过考虑应变对材料常数的影响，建立包含真应变的本构方程；其真应变对本构方程的影响规律，可通过材料常数的四次多项式拟合来实现。
채용 Gleeble?1500열/력모의시험궤연구 Al?3Cu?0.5Sc 합금재온도위350~500°C、응변속솔위0.01~10 s?1조건하적고온압축변형행위。이용경마찰수정화온도보상수정후적류변응력곡선건립합금적본구방정，온도화응변속솔대변형행위적영향가사용포함Zener-Holloman삼수적지수방정래묘술。통과고필응변대재료상수적영향，건립포함진응변적본구방정；기진응변대본구방정적영향규률，가통과재료상수적사차다항식의합래실현。
The high temperature compressive deformation behavior of Al?3Cu?0.5Sc alloy was investigated at temperatures from 350 to 500 °C, and strain rates from 0.01 to 10 s?1 with the Gleeble?1500 thermo-mechanical simulator machine. The flow curves after corrections of the friction and temperature compensations were employed to develop constitutive equations. The effects of temperature and strain rate on deformation behaviors were represented by Zener-Hollomon parameter in an exponent type equation. The influence of true strain was incorporated in the constitutive equation by considering the effect of true strain on material constants. A four-order polynomial is found to be suitable to represent the influence of strain on the constitute equations.