ZL109合金的变载荷蠕变行为研究  

Creep behavior of ZL109 alloy under stress changes

作　　者：黄明华[1] 王浩伟[1] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200030

出　　处：《航空材料学报》2003年第z1期92-94,共3页Journal of Aeronautical Materials

基　　金：国家自然科学基金(59901006)

摘　　要：研究了350℃下ZL109铝合金在外加应力变化条件下的瞬时蠕变行为。当外加应力突然降低后,在瞬时蠕变过程中发生了弹性应变和滞弹性应变,整个降载过程中的应变变化值与应力变化值成线性关系。快速滞弹性应变后,在低的松弛应力下的蠕变应变继续增加,这不同于短纤维增强复合材料稳态蠕变过程中降载后在低应力下的蠕变行为。在不同的载荷变化过程中,应力变化越大,ZL109铝合金越容易断裂。Constant stress creep and stress change-strain transient creep of ZL109 alloy have been investigated at 350℃ . During the transient creep after stress decrease, it has been found that the total strain transient consists of two components, elastic strain and anelastic strain. The total strain changes are linear with the stress changes. After rapid strain response, the creep strain of ZL109 alloy under the low stress doesn' t back flow as those of fiber reinforced composites do. Rupture analyses show that large stress changes cause, specimens to fracture easily.

关 键 词：铝合金 蠕变 瞬时应变 应力变化 

分 类 号：TG1113.2[金属学及工艺—物理冶金]