一、引言 应力腐蚀开裂敏感及疲劳强度较低,是高强度铝合金应用中面临的两个主要问题。应力腐蚀造成的低应力破断,常常引起灾难性后果。虽然过时效处理可以显著改善应力腐蚀敏感性,但同时也使合金的强度比时效峰状态有所降低,因此,不能充分发挥材料的性能潜力。形变热处理可以提高高强铝合金的强度,但对该类合金应力腐蚀及疲劳强度的影响,尚缺乏深入研究。本文试图通过对形变热处理LC4合金组织和性能的 I. INTRODUCTION Stress corrosion cracking is sensitive and fatigue strength is low, which is the two major problems in high-strength aluminum alloy applications. Low stress rupture caused by stress corrosion often leads to disastrous consequences. Although over-aging treatment can significantly improve the stress corrosion susceptibility, but also make the strength of the alloy than the aging peak state decreased, therefore, can not give full play to the performance potential of the material. Deformation heat treatment can improve the strength of high strength aluminum alloy, but the impact of such alloys stress corrosion and fatigue strength, the lack of further study. This article attempts to heat treat LC4 by microstructure and properties of the alloy