Study on hot compression deformation behavior of a brush alloy Ag-Pd-Cu-X
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摘要:
在变形温度650~950 ℃，应变速率0.001~0.1 s -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210.369 kJ/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。
Abstract:
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.