Mg基非晶合金的形成能力和力学性能分析

摘要

The alloys rods with diameters of 3.0 mm of Mg81Zn17Ca2, Mg14Zn22Ca64, Mg63Zn32Ca5 and Mg65Zn30Ca5 were prepared by copper mold with suction casting method in water cooling crucible. Formation ability and mechanical properties of Mg-based amorphous alloys were analyzed mainly by X-ray diffraction（XRD） and scanning electric microscopy（SEM）. The results show that： the amorphous formation ability of Mg65Zna0Ca5 is best, Mg63Zn32Ca5 and Mg14Zn22Ca64 followed, Mg81Zn17Ca2 is weakest. The mechanical properties of Mg65Zn30Ca5 is best, with breaking strength about 519 MPa, MgszZn17Ca2 followed, about 493 MPa, the breaking strength of Mg63Zn32Ca5 and Mg14Zn22Ca64 is low. Four different elements of Mg-Zn-Ca alloys are brittle fracture, almost no plastic strain.%在水冷铜坩埚中采用铜型吸铸法制备直径为3mm的棒状Mg81Zn17Ca2、Mg63Zn32Ca5、Mg65Zn30Ca5合金材料，利用X射线衍射仪（XRD）和扫描电子显微Mg14Zn22Ca64、镜（SEM）等对Mg基非晶合金的形成能力和力学性能进行研究。结果表明：Mg65Zn30Ca5的非晶形成能力最强，Mg63Zn32Ca5和Mg14Zn22Ca54次之，Mg8iZn17Ca2最弱。Mg65Zn30Ca5力学性能519MPa；Mg811Zn17Ca2次之，约为493MPa；Mg63Zn32Ca5和Mg14Zn22Ca64最好，断裂强度最大约为断裂强度都较低。四种成的分的Mg-Zn-Ca合金均为脆性断裂，几乎没有塑性应变。