Hypergravity promoted mechanical degradation in CuZn alloy

Abstract

The mechanical behavior and properties of materials under extreme conditions have always been the focus of materials science research, as they determine the stability and safety of various application settings. The extreme conditions of the hypergravity environment have long been simplified to conventional stress conditions, and their actual effect on the mechanical behavior and properties of materials remains to be verified. Here we specifically delve into the mechanical properties of CuZn alloys subjected to hypergravity conditions. Notably, we observe a decrease in both modulus of elasticity and hardness as hypergravity stress and gradient stresses intensified. Intriguingly, similar degradations in mechanical properties are evident in CuZn alloys exposed to gradient stresses under normal gravity, deviating from the typical work hardening response under standard stress. This anomalous behavior is proposed to stem from the heightened dislocation mobility facilitated by stress gradients and hypergravity, which subsequently diminishes the dislocation hardening effect. Our findings offer valuable insights into the mechanical behavior of materials under hypergravity, enhancing our comprehension of how materials evolve mechanically in extreme environments.