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| Zr–2.5Nb合金热变形行为研究 |
| Hot Deformation Behavior of Zr-2.5Nb |
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| DOI：10.3969/j.issn.1674-6457.2022.06.009 |
| 中文关键词: Zr–2.5Nb 温度 应变速率 激活能 |
| 英文关键词: Zr-2.5Nb temperature strain rate activation energy |
| 基金项目:西安航空职业技术学院2019年度科研计划(19XHZK–004) |
| Author Name | Affiliation | | GENG Pei | Aviation Materials Engineering School, Xi'an Aeronautical Polytechnic Institute, Xi'an 710089, China | | GONG Xiao-tao | Aviation Materials Engineering School, Xi'an Aeronautical Polytechnic Institute, Xi'an 710089, China | | CHEN Wen-jing | Aviation Materials Engineering School, Xi'an Aeronautical Polytechnic Institute, Xi'an 710089, China | | ZHOU Chao | Aviation Materials Engineering School, Xi'an Aeronautical Polytechnic Institute, Xi'an 710089, China | | MA Jing | Aviation Materials Engineering School, Xi'an Aeronautical Polytechnic Institute, Xi'an 710089, China |
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| 中文摘要: |
| 目的 研究Zr–2.5Nb合金热压缩后的应力–应变关系和合金变形激活能。方法 对Zr–2.5Nb进行高温压缩试验，分析变形条件(温度和应变速率)对该合金热变形行为的影响，研究高温压缩过程中Zr–2.5Nb合金的显微组织变化，并基于Arrhenius公式分析其变形激活能。结果 在低温、高应变速率条件下，Zr–2.5Nb合金应力由峰值快速降低直至达到稳态;在高温和低应变速率下，该合金的应力–应变曲线呈现动态再结晶特征，合金平均变形激活能为468.962 kJ/mol，硬化指数为5.41。结论 在850~1 000 ℃下进行不同应变速率的热压缩变形时，高温低应变速率有利于Zr–2.5Nb动态再结晶的发生;同一温度条件下，低应变速率时合金变形激活能较小，有利于Zr–2.5Nb合金发生塑性变形。 |
| 英文摘要: |
| Based on hot compression experiments, the paper aims to analyze the high temperature stress-strain relationship and the deformation activation energy of Zr-2.5Nb alloy. The effect of deformation temperature and strain rate on the rheological behavior of Zr-2.5Nb alloy was investigated by high temperature compression test, and the deformation activation energy was analyzed based on Arrhenius relation. At low temperature and high strain rate, the stress-strain curves of Zr-2.5Nb alloy showed obvious dynamic recrystallization characteristics, while at high temperature and low strain rate, the stress-strain curves of Zr-2.5Nb alloy decreased rapidly from peak to steady state, the average activation energy of deformation was 468.962 kJ/mol, and the hardening exponent was 5.41. Under 850-1 000 ℃ hot compression deformation condition, low strain rate is favorable to the plastic deformation of Zr-2.5Nb alloy. High temperature and low strain rate is favorable to the dynamic recrystallization of Zr-2.5Nb. |
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