在热处理和多轴造下,Ti-6Al-4V合金的微观结构和机械性能的演变
Sijie Du1, Yang Song1, Yiting He1
1School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
Materials (Basel, Switzerland)
|March 13, 2024
概括
这项研究开发了一种具有双模微结构的超细粒度 (UFG) Ti-6Al-4V合金. 通过受控热处理和多轴造,新型加工实现了优越的强度 (1280 MPa) 和延伸 (10.7%).
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是一种金工业.
- 机械工程 机械工程
背景情况:
- Ti-6Al-4V合金的机械性能严重依赖于它们的微观结构特性.
- 开发先进的微结构是提高合金性能的关键.
研究的目的:
- 设计一种具有双模粒分布的超细粒度 (UFG) Ti-6Al-4V合金.
- 为了研究在加工过程中微观结构的演变.
- 为了将微观结构与机械性能相关联.
主要方法:
- 在900°C和950°C进行了热处理,随后进行了空气冷却.
- 采用多轴造 (MF) 来改进谷物结构.
- 应用化以稳定微观结构并分析位移密度.
主要成果:
- 在900°C处理和MF后,通过包围微米大小的初级α (αp) 颗粒的α+β超细粒 (UFGs) 实现了双模微结构.
- 在950°C处理和MF后观察到扭曲的αs片状和碎片化的β粒围绕αp粒.
- 消除了UFG在后的几何上必要的位移 (GND),与αp粒中的残留GND.
- 在900°C处理和冷的样品中达到高强度 (1280 MPa) 和总延长 (10.7%).
结论:
- 一种涉及热处理,MF和回火的新型加工途径有效控制了Ti-6Al-4V的微结构.
- 由此产生的双模UFG微结构显著提高了机械性能,提供了卓越的强度和柔性.
- 这种方法为设计高性能Ti-6Al-4V合金提供了一条途径.
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