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在外部应力下,Ni-Al合金中的γ'相的拉夫和再溶解

Jiajia Chen¹, Shenglong Wang^1,2, Kunwu Lai^1,2

¹School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.

|December 25, 2023

概括

这项研究揭示了压力和高温如何影响基于的超级合金的微观结构. 了解玛-prime (γ′) 阶段的漂浮和再溶解对于改善合金性能至关重要.

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.
计算材料科学科学计算材料科学

背景情况:

基于的超级合金的机械性能严重依赖于γ′-Ni₃Al相的体积分数和漂流度.
高温爬行可以导致和γ′相的重新溶解,损坏这些合金的微观结构和特性.

研究的目的:

为了研究高温和应力条件下的Ni-Al合金中的γ′相的漂浮和再溶解行为.
阐明控制 γ′漂流的驱动力和动力演变.

主要方法:

用相场模拟来建模微观结构的演变.
分析的重点是温度,应力和弹性能量差异对元素扩散和相位形态的影响.

主要成果:

在 γ 道中的无向弹性能量驱动着定向扩散,形成 γ′.
增加的拉力应力减少了γ′阶段的特定表面积,减缓了再溶解,并保持了更高的体积分数.
高温导致压力下更扩散和更宽的γ/γ′相接口.

结论:

这项研究提供了对Ni基超级合金中g′相基本漂浮机制的见解.
这些发现澄清了在极端温度和应力条件下微结构演变的动力学,这对于合金设计至关重要.

关键词:

运动学运动学基超级合金是基于的超级合金.通过重新溶解来解决问题.压力压力压力压力的 γʹphase 阶段.

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