High-temperature Deformation Behavior of New Near-β Titanium Alloy Ti-7333
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摘要: 对新型近β钛合金Ti-7333进行等温压缩试验,并对合金的流变行为进行研究。研究结果表明:Ti-7333的流变应力对变形参数的变化十分敏感,随着温度的升高和应变速率的下降,流变应力显著减小;合金的变形以动态回复为主,动态再结晶为辅。基于Mecking和Bergstrom提出的合金热变形过程中的位错密度演变模型建立了Ti-7333合金的本构模型,准确地描述了合金热变形过程中的流变应力,并且模型中参数数量较少,便于应用。Abstract: Compression tests were conducted under constant temperature to investigate the flow behavior of the new near-β titanium alloy Ti-7333.The results reveal that flow stress of the tested alloy is very sensitive to processing parameters.With the increase of temperatures and decrease of strain rates,the flow stress of Ti-7333 significantly decreases.The flow behavior of the alloy is dominated by dynamic recovery,acompanied by dynamic recrystallization.In addition,based on the evolution model of dislocation density put forward by Mecking and Bergstrom,a constitutive model was constructed to predicate the flow stress of Ti-7333.Due to its relatively limited parameter numbers,this model could be conveniently applied to accurately describe the flow stress during thermal deformation of the alloy.
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Key words:
- titanium alloy /
- thermal deformation /
- flow stress /
- dynamic recovery /
- dynamic recrystallization /
- constitutive model
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