设计一种附加制造的Ti-Al-Fe合金,具有广泛的工艺窗口
Leyu Cai1, Zixuan Hong1, Feng Xu1,2
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|November 13, 2025
概括
开发了一种新的合金 (Ti-5.2Al-5Fe),用于激光粉床融合 (LPBF),提供良好的强度和可塑性. 低可塑性与α阶段的残余应力有关,指导了未来的合金设计.
科学领域:
- 材料科学 材料科学 材料科学
- 添加剂制造 添加剂制造 添加剂制造
- 金工业是金工业的一个方面.
背景情况:
- 激光粉床融合 (LPBF) 需要专门的合金以获得最佳性能.
- 开发具有定制性能,具有成本效益的合金对于先进应用至关重要.
研究的目的:
- 为LPBF设计和制造一种新的,具有成本效益的合金 (Ti-5.2Al-5Fe重量%).
- 为了优化合金的低密度,高强度和良好的β相稳定性.
- 研究组合对可加工性和微观结构的影响.
主要方法:
- 合金设计和组合优化 (Ti-5.2Al-5Fe).
- 使用激光粉床融合 (LPBF) 的制造.
- 微观结构的表征,机械性能 (拉伸性,硬度) 和缺陷分析 (孔隙性,EBSD).
主要成果:
- 实现了低密度 (4.4 g/cm3),高收益率强度 (1052 MPa) 和高硬度 (>400 HV).
- 在广泛的能量密度范围内表现出高密度 (孔径≤2%) 的优良可塑性.
- 在已构建的微观结构中确定了α和β相,α相含量随能量密度而变化.
- 观察到高拉伸强度 (>1290 MPa),但延展性有限 (<2.6%).
- EBSD分析显示,α阶段的微残余应力是低延展性的原因.
结论:
- 新型Ti-5.2Al-5Fe合金对LPBF应用具有前景,因为其有利的性能和广泛的工艺窗口.
- 了解α阶段残余应力的作用是改善未来LPBF合金的可塑性的关键.
- 本研究提供了对LPBF专用合金的合金设计和微结构机制的见解.
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