CAJ | 학술논문

采用表面覆盖剂及氩气保护的熔炼方法制备了 Mg -5Li -xY(x ＝0,1,2,3,4)合金,研究了稀土元素 Y 对挤压态 Mg -5Li 合金的显微组织及力学性能的影响.研究结果表明,Mg -5Li 合金中的 Y 元素主要是以稀土化合物 Mg24 Y5的形式存在于合金中；挤压变形后,合金发生了明显的动态再结晶,出现了大量的等轴晶,弥散分布的 Mg24 Y5相阻碍了动态再结晶过程中的晶粒长大,晶粒明显细化.挤压态 Mg -5Li -3Y 合金获得了优异的力学性能,其抗拉强度和断裂伸长率分别达到了231.63 MPa 和9.35%,合金断裂方式主要为韧性断裂.
채용표면복개제급아기보호적용련방법제비료 Mg -5Li -xY(x ＝0,1,2,3,4)합금,연구료희토원소 Y 대제압태 Mg -5Li 합금적현미조직급역학성능적영향.연구결과표명,Mg -5Li 합금중적 Y 원소주요시이희토화합물 Mg24 Y5적형식존재우합금중；제압변형후,합금발생료명현적동태재결정,출현료대량적등축정,미산분포적 Mg24 Y5상조애료동태재결정과정중적정립장대,정립명현세화.제압태 Mg -5Li -3Y 합금획득료우이적역학성능,기항랍강도화단렬신장솔분별체도료231.63 MPa 화9.35%,합금단렬방식주요위인성단렬.
With the protection of surface covering agents and argon protection,the Mg-5Li-x Y (x =0,1 ,2,3,4)alloys were prepared by conventional casting methods.The effects of rare earth on microstructure and mechanical properties of the as-extruded alloys were investigated.The results showed that the RE compound Mg24 Y5 generated after adding Y into the Mg-5Li alloy.The dynamic recrystallization arose during the hot extrusion process,leading to a large number of equiaxed grains appeared.The dispersive distribution of Mg24 Y5 phase hindered the growth of the grains during the dynamic recrystallization,which led to the grain refinement.The as-extruded Mg-5Li-3Y alloy achieved the best mechanical property:the tensile strength and elongation reached up to 231.63 MPa and 9.35%,respectively.The fracture mode of the alloy is mainly ductile fracture.