喷射沉积Mg-Al-Ca合金微合金化成分分析与挤压工艺

Trace Alloy Composition Analysis in Sprayed-deposited Mg-Al-Ca Alloy and its Squeezing Casting

采用喷射沉积工艺制备了各种微合金化Mg-Al-Ca合金,分析组织和性能结果得知,微合金化元素Nd的含量为1%时,合金的综合力学性能最佳,该合金的组织中第二相分布均匀、细小,平均尺寸小于1μm,合金的抗拉强度达到480MPa,伸长率达到了8%;扫描电镜分析表明,合金中均匀分布的第二相是Al2Ca相,为密排六方结构。对该合金的挤压工艺研究表明,当挤压比小于20时,合金的强化效果非常明显,当挤压比高于20时,随着挤压比的提高,强度的提高不明显。

Microstructure and mechanical properties of the trace alloying Mg-Al-Ca alloy prepared by spraying-deposition method were investigated. The results show that the alloy with 1%Nd content exhibits desirable comprehensive mechanical properties,in which fine secondary phase with average size less than 1μm is homogeneously distributed,and tensile strength and elongation reach up to 480MPa and 8%,respectively. The SEM (scanning electron microscope) analysis shows that secondary phase is Al2Ca phase with HCP structure. With increasing in squeezing ratio when it is less than 20,mechanical properties of the alloy are greatly improved,while squeezing ratio is more than 20,with it increases,increase of tensile strength tends to slow.