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论文类型：期刊论文

发表时间：2019-02-01

发表刊物：METALS

收录刊物：SCIE

卷号：9

期号：2

ISSN号：2075-4701

关键字：Arrhenius model; Johnson-Cook model; Ti2AlNb-based alloy; high-temperature deformation

摘要：In order to thoroughly understand the quantitative relationships between the flow stress and deformation conditions for Ti2AlNb-based alloys at elevated temperatures, the Arrhenius and Johnson-Cook constitutive models are analyzed and identified on the basis of the uniaxial tensile tests. The Johnson-Cook model is modified so that the referenced temperature range can be randomly adjusted. By experimental verification, the Arrhenius model (including the Backofen model) is suitable for the deformation at relatively low strain-rate deformation, such as the superplastic forming, and the modified J-C model is applicable for the deformation within a wide range of strain rates. For deformation at high temperatures, the constitutive model enables a more precise description of the effect of strain on the flow stress through introducing as train-softening factor exp(s epsilon).