挤压态ZM61-Sn合金的显微组织及高温力学性能（英文）  

Microstructures and Elevated Temperature Mechanical Properties of As-extruded ZM61-Sn Alloys

作　　者：唐甜[1,2] 张丁非[1,2] 胡光山[1,2] 胥钧耀[1,2] 潘复生[2,3] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆大学国家镁合金材料工程技术研究中心,重庆400044 [3]重庆市科学技术研究院,重庆401123

出　　处：《稀有金属材料与工程》2017年第8期2102-2107,共6页Rare Metal Materials and Engineering

基　　金：National Great Theoretic Research Project(2013CB632200);National Natural Science Foundation of China(51474043);Chongqing Municipal Government Project(CSTC2013JCYJC60001);Education Commission of Chongqing Municipality(KJZH14101);Sharing Fund of Chongqing University's Large-scale Equipment

摘　　要：利用金相显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)和高温拉伸对挤压态ZM61-x Sn(x=2,4,8,质量分数,%)合金的显微组织、高温力学性能和断裂机制进行了研究。结果表明添加Sn元素可有效细化合金组织且细化效果随Sn含量的增加而增强。挤压态ZM61-x Sn(x=2,4,8)合金的平均晶粒尺寸分别为11,8和4μm。随Sn含量的增加,合金的力学性能先升高后降低。在所有的实验合金中ZM61-4Sn合金的强度最高,当在180℃下进行拉伸实验时,其极限抗拉强度和屈服强度分别为216和173 MPa。合金的延伸率随Sn含量的增加而增加,当拉伸温度为300℃时,ZM61-x Sn(x=2,4,8)合金的延伸率分别为183.8%,235.8%和258.6%。ZM61-4Sn合金具有最好的强度和塑性的结合。试样最后的断裂主要由局部缩颈引起以及试样的主要断裂机制为显微孔洞聚集。当在260和300℃下拉伸时,合金发生了不完全的动态再结晶。Microstructures, elevated temperature mechanical properties and fracture mechanisms of the as-extruded ZM61-xS n（x=2, 4, 8, wt%） alloys were investigated by optical microscope（OM）, X-ray diffraction（XRD）, scanning electron microscope（SEM） and high temperature tensile tests. The results reveal that the addition of Sn can refine microstructures and the refinement effect increases with the increase of Sn content. The average grain sizes of the as-extruded ZM61-xS n（x=2, 4, 8） alloys are 11, 8 and 4 μm, respectively. With the increasing of Sn amount, the strength of experimental alloys increases at first and decreases afterward. ZM61-4Sn alloy shows the highest strength, whose ultimate tensile strength and yield strength are 216 and 173 MPa tested at 180 ℃ respectively. The ductility increases with the content of Sn increasing, and the elongation of as-extruded ZM61-xS n（x=2, 4, 8） alloys are 183.8%, 235.8% and 258.6%, respectively, when tensile temperature reaches 300 ℃ The ZM61-4Sn alloy has the optimal coalescence of strength and ductility. The localized necking leads to the final fracture of the specimens and the micro-void coalescence is the main fracture mechanism. Incomplete dynamic recrystallization occurs when tensile tests are carried out at 260 and 300 ℃

关 键 词：ZM61-Sn合金 挤压 显微组织 高温力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]