摘要
通过真空感应熔炼并结合快速冷却的方法制得齿轮用ZK60镁合金,分析Y添加量对其微观组织及拉伸性能的影响。研究结果表明:真空感应熔炼ZK60合金获得了细小组织,α-Mg晶粒都是以尺寸较小的枝晶结构存在,晶粒外径尺寸减小到了26μm以内。真空感应熔炼过程也会产生晶粒细化效果,使合金内形成更低比例的β相。Y加入量至1%,得到的合金基体内形成了更细的晶粒。此时真空感应熔炼ZK60合金形成了更大的晶粒,达到18.1μm。当枝晶不断长大后可以对含Al液相起到连接的作用,得到具有网状结构的β-Mg17Al12相。随着Y添加量的增加,真空感应熔炼ZK60合金的拉伸强度和延伸率均表现出先增加后减小,最大值发生在最佳含量Y为1%时,此时拉伸强度和延伸率分别取值为378 MPa和11.26%。
The properties of ZK60 Al-Mg alloy,an advanced gear material for aircraft engine and produced by vacuum induction melting combined with rapid solidification,were modified by doping of yitrium.The influence of the Y-doping on the microstructures and tensile properties was investigated with X-ray diffraction,scanning electron microscopy and tensile behavior measurement.The results show that the Y-doping had a major impact.To be specific,as the Y-content increased,the tensile strength and elongation ratio changed in an increase-decrease mode,maximizing to 378 MPa and 1.26%,respective,at 1%(wt)Y.Addition of 1.0% Y resulted in the formation of a large amount of finer equiaxed grains,coexisting with the fairly large dendrite α-Mg grains(18.1 μm in size).We found that the growth of the dendrite α-Mg grains were responsible for the formation of β-Mg17Al12-phased reticular framework.
作者
关锋
程军丽
Guan Feng;Cheng Junli(Department of Mechanical Engineering,Shanxi Vocational College of Mechanical and Electrical Engineering,Changzhi 046011,China;China North Industries Group Huaihai Industry Group Co.,LTD.,Changzhi 046011,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2020年第10期978-982,共5页
Chinese Journal of Vacuum Science and Technology
基金
山西省高等学校科技创新项目(20161128)。
关键词
稀土Y
ZK60镁合金
快速凝固
组织细化
拉伸性能
Rare earth Y
ZK60 magnesium alloy
Rapid solidification
Organization refinement
Tensile properties
作者简介
联系人:关锋,E-mail:zetuojinai@126.com。
