摘要
进行了7～500μm厚度的自由无束缚铝合金薄膜在高温和恒载荷下的蠕变实验,研究了高温蠕变速率与薄膜厚度和晶粒大小的关系.在变形机理图中表示了该实验的位置,分析了变形的机理;观察了蠕变断口的形貌,分析了蠕变寿命与蠕变速率的关系.结果表明,自由无束缚薄膜的蠕变规律随厚度(h)和晶粒尺寸(d)的变化而变化,在h/d<1时,蠕变速率与厚度和晶粒大小有较强的依存关系,显示不同于块状材料的特征.
Creep tests of free-standing aluminum thin film with thickness range 7-500μm were carried out at high temperature and constant load. The relationship between the creep rate and the thickness and grain size was studied. The creep parameters were located on the deformation mechanism map and the creep mechanism was discussed. The fracture surface was observed with scanning electron microscopy (SEM) and the creep rate dependence of the fracture time was obtained. It is shown that the creep rate of the free-standing thin film is dependent on the thickness and the grain size when h/d<1 and the characteristics differ from that of the bulk material.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2004年第2期304-307,共4页
Journal of Shanghai Jiaotong University
关键词
铝合金
自由薄膜
厚度
晶粒大小
蠕变
断裂
Creep
Deformation
Fracture
Grain size and shape
Metallic films
Scanning electron microscopy
Thin films
