Zhang Shunyong, Zhang Bin, Zhao Fengpeng, Li Jicheng, Wei Liming, Huang Xicheng
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, China.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621999, China.
Materials (Basel). 2024 Dec 19;17(24):6216. doi: 10.3390/ma17246216.
The effects of aging treatment and the volume fraction of precipitation particles on the nano-hardness and nano-indentation morphology of Ni-based single crystal superalloys are systematically investigated. Using nano-indentation tests and atomic force microscopy (AFM), this study examined the mechanical properties and related physical mechanisms of Ni-based superalloys that have two volume fractions of precipitation particles and four aging treatment times. Results analyzed using the Oliver-Pharr method indicate that prolonging the aging time or increasing the volume fraction of particles enhances the nano-hardness and creep resistance of Ni-based single crystal superalloys and reduces the indentation-affected area. Additionally, the nano-hardness and elastic modulus decrease gradually with increasing applied force, revealing an obvious indentation size effect. These variations are closely linked to the size and density of particles and work hardening rate, as well as to the topologically close-packed (TCP) phases, which influence dislocation movement and accumulation within the material and lead to various nano-indentation behavior in Ni-based single crystal superalloys. The related study provides theoretical guidance and experimental data to support the design and application of superalloys.
系统研究了时效处理和析出相粒子体积分数对镍基单晶高温合金纳米硬度和纳米压痕形貌的影响。本研究通过纳米压痕试验和原子力显微镜（AFM），考察了具有两种析出相粒子体积分数和四种时效处理时间的镍基高温合金的力学性能及相关物理机制。使用Oliver-Pharr方法分析结果表明，延长时效时间或增加粒子体积分数可提高镍基单晶高温合金的纳米硬度和抗蠕变性，并减小压痕影响区域。此外，纳米硬度和弹性模量随外加力增加而逐渐降低，呈现出明显的压痕尺寸效应。这些变化与粒子的尺寸和密度、加工硬化率以及拓扑密排（TCP）相密切相关，TCP相影响材料内部位错的运动和积累，导致镍基单晶高温合金出现各种纳米压痕行为。相关研究为高温合金的设计和应用提供了理论指导和实验数据。
