Yang Longlong, Sun Kun, Wu Huaying
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Nanomaterials (Basel). 2023 Jun 28;13(13):1969. doi: 10.3390/nano13131969.
Inconel 718 (IN 718) superalloys are widely used as engineering materials owing to their superior mechanical performance. And voids are unavoidable defects in IN 718 superalloy preparation, which dramatically affect the mechanical properties of IN 718 superalloys. In this work, the effects of void radius, distance from the top of the void to the substrate surface, and substrate temperature on the mechanical properties of the Ni/Ni3Al crystal are systematically investigated. It is shown that voids affect the formation of stair-rod dislocations and Shockley dislocations in the substrate, which in turn determines the mechanical properties. Thus, with the increase in void radius, Young's modulus and hardness gradually decrease. With the increase in void distance, Young's modulus and hardness increase and finally tend to be stable. In addition, the increase in substrate temperature leads to the interphase boundary becoming irregular and increases the defects in the γ and γ″ phases. As a result, Young's modulus and hardness of the substrate decrease. This work aims to provide a guideline for investigating the indentation properties of Ni-based superalloys using MD.
因科镍合金718（IN 718）超级合金因其优异的机械性能而被广泛用作工程材料。气孔是IN 718超级合金制备过程中不可避免的缺陷，这极大地影响了IN 718超级合金的机械性能。在这项工作中，系统地研究了气孔半径、气孔顶部到基体表面的距离以及基体温度对Ni/Ni3Al晶体机械性能的影响。结果表明，气孔影响基体中阶梯杆位错和肖克利位错的形成，进而决定了机械性能。因此，随着气孔半径的增加，杨氏模量和硬度逐渐降低。随着气孔距离的增加，杨氏模量和硬度增加并最终趋于稳定。此外，基体温度的升高导致相间边界变得不规则，并增加了γ相和γ″相中的缺陷。结果，基体的杨氏模量和硬度降低。这项工作旨在为使用分子动力学研究镍基超级合金的压痕性能提供指导。
