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研究了铸态KBM10镁合金在温度573~673K,应变速率5×10~(-4)~5×10~(-2)s~(-1)内高温压缩变形过程中的微观组织演变,分析了变形温度和应变速率对该合金动态再结晶行为的影响,分析了温度、应变速率与流变应力的关系。结果表明:KBM10镁合金高温压缩塑性变形的主要软化机制为动态再结晶,温度和应变速率二者均是影响再结晶形核和长大的主要因素。在本实验条件下,KBM10镁合金的变形本构方程可拟合为双曲正弦函数ε=-A[sinh(ασ)]~nexp(-Q/RT),其中应力指数n为4.717,激活能为149.8 kJ/mol.
The microstructure evolution of as-cast KBM10 magnesium alloy during high temperature compressive deformation at temperature from 573 to 673 K and strain rate from 5 × 10 -4 to 5 × 10 -2 s -1 was studied. The effect of deformation temperature and strain rate on the dynamic recrystallization behavior of the alloy was analyzed. The relationship between temperature and strain rate and the flow stress was analyzed. The results show that the main softening mechanism of high temperature compression plastic deformation of KBM10 magnesium alloy is dynamic recrystallization. Both temperature and strain rate are the main factors that influence the nucleation and growth of recrystallized grains. Under this experimental condition, the deformation constitutive equation of KBM10 magnesium alloy can be fit to hyperbolic sine function ε = -A [sinh (ασ)] ~ nexp (-Q / RT), in which the stress exponent n is 4.717 and the activation energy 149.8 kJ / mol.