电刷材料Ag-Pd-Cu-X合金的热变行为分析  

Study on hot compression deformation behavior of a brush alloy Ag-Pd-Cu-X

作　　者：王勇[1] 胡建旗[1] 徐永红 章应 谈春林[1] 陈蓉 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆川仪金属功能材料分公司,重庆400702

出　　处：《重庆大学学报（自然科学版）》2014年第3期10-15,22,共7页Journal of Chongqing University

基　　金："十二五"国家科技支撑计划资助项目(2012BAE06B06)

摘　　要：在变形温度650～950℃，应变速率0．001～0．1s^-1的条件下，采用Gleeble-1500热模拟实验机对Ag—Pd—Cu—X合金进行了热模拟压缩实验，分析了合金微观组织及流变应力变化规律，建立了合金的热变形本构方程。结果表明：当变形温度由650℃升高到750℃以后，合金的热变形软化机制由动态回复为主转向以动态再结晶为主，流变应力呈现出明显的逐渐降低趋势。合金在变形温度750～950℃的热变形激活能为210．369kJ／mol。利用所建立的本构方程计算得到的预测值与实验值吻合良好，证明了所建立本构方程的正确性。Hot compression deformation of Ag-Pd-Cu-X alloy is performed on Gleeble-1500 thermal simulator with strain rates of 0. 001-0.1 s^-1 and temperature at 650-950 ℃. Variations of flow stress and microstructure are investigated. The flow stress constitutive equation of Ag-Pd-Cu-X alloy is established. The results indicate that the dominant softening mechanism shift from dynamic recovery to the dynamic recrystallization with the compression temperature increases from 650 ℃ to 750 ℃ ,the flow stress exhibits a gradual downward trend. While the alloy deforms at 750 - 950 ℃, and the activation energy is 210. 369 kJ/mol. The stress values predicted by the constitutive equation demonstrate well agreement with the experimental results.

关 键 词：AP-2合金 热压缩变形 流变应力 热变形激活能 本构方程 

分 类 号：TG146.2[一般工业技术—材料科学与工程]