自然时效、加工硬化对共享单车轮毂微观组织及性能影响研究

目的 以不同工作状态下AM60B镁合金压铸成形的共享单车轮毂为研究对象,探讨镁合金作为自行车轮毂材料的实际应用特性.方法 选取直接压铸的镁合金轮毂A,放置4年的轮毂B以及通过疲劳试验模拟高强度使用后的轮毂C为研究对象,对不同状态下压铸镁合金轮毂的微观组织、力学性能与阻尼性能进行研究.结果 轮毂A抗拉强度为215 MPa...

Effect of Natural Aging and Work Hardening on Microstructure and Performance of Shared Bicycle Wheels

The work aims to study the shared bicycle wheels of die-casting AM60B magnesium alloys under different working conditions to explore the practical application characteristics of Mg-alloy as bicycle wheels. The wheel A of die-casting magnesium alloy, the wheel B placed for four years, and the wheel C used in high intensity simulated by fatigue test were selected as the research objects to study the microstructure, mechanical properties and damping properties of die-casting alloy under different states. The tensile strength of the wheel A was 215 MPa, yield strength was 97 MPa, and elongation was 17.86%. The microstructure of wheel B had almost no change, but the plasticity declined to some extent, and the damping performance was the best. After fatigue test, wheel C had better strength and plasticity, and the damping performance was improved. The decrease in plasticity of the wheel B and the increase in damping performance may be related to the diffusion of solid solution atoms. The wheel C has a work hardening phenomenon, with a mixed crystal structure locally, which is the reason for the enhanced performance.