在热处理过程中四度性AlCoCrNi高度合金的微结构演变
Elyorjon Jumaev1, Hae-Jin Park2, Muhammad Aoun Abbas2
1FIE UzLITI Engineering LLC, 28B Beshyogoch, Tashkent 100066, Uzbekistan.
Materials (Basel, Switzerland)
|July 27, 2024
概括
热处理改变了,,,, (AlCoCrNi) 的高合金的纳米结构和相位组成. 西格玛阶段增强了产量强度,但减少了压缩应变.
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.
- 物理化学 物理化学
背景情况:
- 高合金 (HEAs) 由于其复杂的组成,具有独特的特性.
- 了解热处理下的微结构演变对于HEA应用至关重要.
- 四次性AlCoCrNi合金对其潜在的机械性能感兴趣.
研究的目的:
- 为了研究长时间热处理对AlCoCrNi HEAs的微观结构和机械性能的影响.
- 分析不同火时间的相位转换和纳米结构变化.
- 为了将微观结构演变与由此产生的机械行为相关联,特别是产量强度和压缩应变.
主要方法:
- 四次性AlCoCrNi高合金在873K的温度下进行了72小时和192小时的热处理.
- 进行微结构分析,观察纳米结构和相位组成的变化.
- 进行了机械性能测试,包括产力强度和压力应变测量.
主要成果:
- 经过72小时的热处理,产生了B2树,BCC树间和西格玛相.
- 延长到192小时的化导致B2树突,树突间西格玛和BCC阶段.
- 形态变化包括树突区域从球形转变为针状,树突区域从旋状转变为板状.
- 纳米级的相位转换发生在树突区域.
- 西格玛相的存在增加了约1172MPa的收益率强度.
- 然而,西格玛阶段显著降低了压力应变,达到0.62%.
结论:
- 热处理的持续时间对AlCoCrNi HEAs的相构和纳米结构产生了重大影响.
- 西格玛阶段的形成是提高产量强度的关键因素.
- 西格玛阶段的存在导致可塑性的不利降低,限制了整体机械性能.
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