铝合金的低温机械性能评估  

Evaluation of mechanical properties for aluminum alloys in low temperature

作　　者：任彦[1] 孙金菊[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《低温工程》2009年第2期56-60,共5页Cryogenics

基　　金：国家863计划(课题编号2007AA05Z202)支持

摘　　要：基于多方面的数据资料,分析阐述了铝合金低温下机械性能的变化规律:随着温度的降低,铝合金屈服强度和抗拉强度有所增加,塑性和韧性有所提高,疲劳特性得到改善。评估了LD5铝合金低温下的机械性能,以及发生冷脆现象的可能性。研究表明:当LD5铝合金用于77 K以上低温环境时,若构件最大应力小于LD5室温下的屈服强度,则构件的低温机械性能可以得到保证。Based on various data and information, the mechanical properties of aluminum alloys in low temperatures were analyzed and illustrated. With the temperature dropping, the yield strength and tensile strength of aluminum alloys increased, the plasticity, toughness and fatigue property improved. The mechanical properties and the brittle possibility of LD5 aluminum alloy in low temperature were evaluated. The investigation shows that when the LD5 aluminum alloy was used above 77 K and the maximum stress of component is less than the yield strength at room temperature, the mechanical properties of the component will be sustained.

关 键 词：LD5 铝合金 低温 冷脆 机械性能 

分 类 号：TB64[一般工业技术—制冷工程]