造和添加摩擦混合沉积高合金之间的微观结构和机械行为比较Al0.35CoCrFeNiNi
Zackery McClelland1, Kyle Dunsford2, Brady Williams3
1US Army Engineer Research and Development Center, Vicksburg, MS 39180, USA.
Materials (Basel, Switzerland)
|February 24, 2024
概括
添加摩擦沉积 (AFSD) 提炼高合金 (HEAs),显著提高强度和减少粒径. 这种固态工艺为结构应用提供了传统造的有希望的替代方案.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 高合金 (HEAs) 通过固溶液强化提供高强度.
- 造HEAs经常表现出大粒和多孔性,限制了它们的结构应用.
- 增材制造为微观结构改进提供了机会.
研究的目的:
- 使用AFSD与造和热处理HEAs比较增材制造Al$_{0.35}$CoCrFeNi的微观结构和机械性能.
- 评估AFSD生产高强度结构HEA组件的可行性.
- 为了研究AFSD加工的HEA的应变率灵敏度.
主要方法:
- 添加摩擦混合沉积 (AFSD) 用于近网形状制造.
- 扫描电子显微镜 (SEM) 用于微观结构分析.
- 准静态和中速压缩测试用于机械评估.
主要成果:
- 与造HEAs相比,AFSD加工导致谷粒大小显著减少.
- 在AFSD沉积物中,沿层接口观察到细颗粒.
- AFSD Al$_{0.35}$CoCrFeNi表现出显著的应变率灵敏度,具有约400MPa的屈服强度差异.
- 强度在准静态和中间应变速率上大约翻了一番.
结论:
- AFSD是一种可行的固态增材制造技术,用于改进HEA微结构.
- 在近静态和中等应变速率下,AFSD加工显著提高了Al$_{0.35}$CoCrFeNi的强度.
- 精致的微观结构和增强的强度使得AFSD加工的HEAs在结构应用中具有前景.
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