| 热处理对挤压镁合金AZ91拉伸变形与断裂行为的影响 |
| |
| 引用本文： | 严琦琦,傅定发,张辉,陈振华.热处理对挤压镁合金AZ91拉伸变形与断裂行为的影响[J].热加工工艺,2006,35(20):10-12. |
| |
| 作者姓名： | 严琦琦 傅定发 张辉 陈振华 |
| |
| 作者单位： | 湖南大学,材料科学与工程学院,湖南,长沙,410082 |
| |
| 摘 要： | 通过金相显微组织观察和断口SEM分析，研究了热处理对挤压AZ91镁合金拉伸变形与断裂行为的影响。结果表明：AZ91镁合金固溶态与挤压态相比抗拉强度变化不大，但伸长率有较大幅度的提高，品粒尺寸有所增大；时效峰值态的抗拉强度与固溶态相比有一定的提高，但伸长率有较大幅度的降低，合金固溶时效处理后伴有强化相粒子析出。AZ91合金挤压态和固溶态的断面都有韧窝特征，为微孔形核的韧性断裂机制，而在时效峰值态的断面上则呈现出了韧性与脆性混合断裂的特征。
|
| 关 键 词： | 变形镁合金 挤压 热处理 拉伸 断裂 |
| 文章编号： | 1001-3814(2006)20-0010-03 |
| 收稿时间： | 2006-04-24 |
| 修稿时间： | 2006年4月24日 |
Effects of Heat Treatment on Tensile Deformation and Fracture Behavior of As-extruded AZ91 Magnesium Alloy |
| |
| YAN Qi-qi,FU Ding-fa,ZHANG Hui,CHEN Zhen-hua.Effects of Heat Treatment on Tensile Deformation and Fracture Behavior of As-extruded AZ91 Magnesium Alloy[J].Hot Working Technology,2006,35(20):10-12. |
| |
| Authors: | YAN Qi-qi FU Ding-fa ZHANG Hui CHEN Zhen-hua |
| |
| Affiliation: | School of Materials Science and Engineering, Hunan University, Changsha 410082, China |
| |
| Abstract: | The effects of heat treatment on the microstructure, tensile deformation and fracture behavior of AZ91 magnesium alloy as-extruded were analyzed and studied by OM and SEM. The results show that comparing as-solution with as-extruded, the tensile strength of AZ91 alloy hardly changes, but its ductility and grain size increase significantly; comparing as-aged with as-solution,the tensite strength increases a litte,but its ductility reduces,with strengthening phase precipitating after solution and aging treatment.The fracture surface of AZ91 as-extruded and as-solution have dimple characteristic,and their fracture mechanism is ductile fracture.However, the fracture mechanism of AZ91 alloy as-aged changes from typical ductile tearing to mixture of ductile and brittle. |
| |
| Keywords: | wrought magnesium alloy as-extruded heat treatment tension fracture |
| 本文献已被 维普 万方数据 等数据库收录！ |
|
