在高温下Ti57-Nb43合金的压缩行为和质地
Máté Szűcs1, Viktor Kárpáti1,2, Tamás Mikó1
1Institute of Physical Metallurgy, Metal-Forming and Nanotechnology, University of Miskolc, Egyetemváros, 3515 Miskolc, Hungary.
Materials (Basel, Switzerland)
|November 25, 2023
概括
这项研究表明,动态再结晶和回收影响了Ti57-Nb43合金的热变形. 一个新的模型准确地预测了各种温度和拉伸率的流应力.
科学领域:
- 材料科学 材料科学 材料科学
- 金工程 金工程 金工程
- 机械工程 机械工程
背景情况:
- 了解- (Ti-Nb) 合金的热变形行为对于优化制造工艺至关重要.
- 以前的研究已经探索了Ti-Nb合金,但仍需要详细研究它们在各种热变形条件下的机械行为,微观结构和晶体纹理.
研究的目的:
- 在热压缩过程中研究Ti57-Nb43合金的机械行为,微观结构和晶体纹理.
- 开发基于温度和延展率的流应力预测模型.
- 分析动态再结晶/回收对变形纹理的影响.
主要方法:
- 对圆柱形Ti57-Nb43合金样品的压缩测试是在700-1000°C的温度下进行的,并且应变速率在0.001-1.0s-1.0s之间.
- 使用修改的Voce类型方程和一种新的两变量多项式函数,分析应力-应变曲线.
- 使用X射线衍射和粘性塑料多晶自相一致 (VPSC) 建模的晶体纹理的表征.
主要成果:
- 由于动态再结晶/恢复,观察到硬化后的软化行为.
- 一个四参数模型准确地描述了流动曲线,一个新的多项式函数预测了在研究范围内的流动应力.
- 结晶学纹理显示了双 <100> 和 <111> 纤维和 (001) <110> 组件,VPSC 建模证实了动态再结晶对纹理强度的影响,但没有发展.
结论:
- 开发的模型为Ti57-Nb43合金在热变形条件下的流应力提供了一个预测工具.
- 动态再结晶和恢复显著影响机械反应和质地演变.
- 这些发现有助于更好地了解Ti-Nb合金的加工和性能.
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