Constitutive Equation and Processing Parameter Sensitivities for Hot Deformation of Pure Mo

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-01-21 DOI:10.1007/s12540-024-01886-4

Liying Yao, Yuan He, Liujie Xu, Zhou Li, Yimin Gao, Guojun Zhang

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Abstract

The hot deformation behavior of powder metallurgy pure Mo is investigated by analyzing constitutive equations, the strain rate sensitivity (SRS) and temperature sensitivity (TS) coefficient distribution maps, and microstructure evolution. Hot compression tests are conducted at different temperatures and strain rates range of 1000–1300 °C and 0.005–1 s⁻¹, with a constant true strain of 0.5. The results show that the flow behavior is greatly affected by deformation temperatures and strain rates, exhibiting typical hardening and softening stages. The constitutive equation is established, and the apparent activation energy Q is estimated as 456 kJ/mol. Furthermore, the SRS coefficient increases with increasing deformation temperature and decreasing strain rate, while the TS coefficient increases with increasing deformation temperature at high strain rates. Together with microstructure evolution, it shows an optimum hot working parameter of 1300 °C/0.005 s⁻¹.

Graphical Abstract

Abstract Image

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纯钼热变形本构方程及工艺参数敏感性

通过分析粉末冶金纯钼的本构方程、应变率灵敏度（SRS）和温度灵敏度（TS）系数分布图以及显微组织演变，研究了其热变形行为。热压缩试验温度为1000 ~ 1300℃，应变速率为0.005 ~ 1 s−1，真应变恒定为0.5。结果表明：变形温度和应变速率对流变行为影响较大，表现为典型的硬化和软化阶段；建立了本构方程，估计表观活化能Q为456 kJ/mol。在高应变速率下，SRS系数随变形温度的升高和应变速率的降低而增大，而TS系数随变形温度的升高而增大。结合显微组织演化，发现该合金的最佳热加工参数为1300℃/0.005 s−1。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.