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在温度为700~850°C和应变速率为0.001~1s~(-1)的条件下,研究了Zr_(50)Ti_(50)合金在β单相区的热变形行为和组织演变。流变曲线呈现典型的流变软化特征。在较高的应变速率下,出现了不连续屈服现象,这一特点在其他传统锆合金中没有发现。计算得到表观变形激活能为103 kJ/mol,并建立了该合金在β单相区的流变应力与应变速率和变形温度之间的本构方程。分析表明该合金的热变形机制主要为动态回复,并且由于较强的动态回复效果而抑制了动态再结晶。随后,通过计算建立了合金的热加工图,并根据热加工图找到了合金在β单相区的最佳热变形加工参数为温度830~850°C,变形速率为0.56~1s~(-1)。
The thermal deformation behavior and microstructure evolution of Zr 50 Ti 50 alloy in β single-phase zone were investigated at 700-850 ° C and strain rate of 0.001-1s -1. The rheological curve shows typical rheological softening characteristics. Discontinuous yielding occurs at higher strain rates, a feature not found in other conventional zirconium alloys. The calculated activation energy of apparent deformation is 103 kJ / mol, and the constitutive equation is established between the flow stress, the strain rate and the deformation temperature of the alloy in β single phase zone. The analysis shows that the hot deformation mechanism of the alloy is mainly dynamic recovery, and the dynamic recrystallization is restrained due to the strong dynamic recovery effect. Subsequently, the hot working diagram of the alloy was established by calculation and the optimal hot deformation parameters of the alloy in β single phase zone were found to be 830 ~ 850 ° C and 0.56 ~ 1s ~ (-1) ).