热挤压道次对Al_(2)O_(3)颗粒增强AZ91D合金力学性能的影响  

Effect of hot extrusion pass on mechanical properties of AZ91D alloy reinforced by Al_(2)O_(3) particles

作　　者：原涛 YUAN Tao(Department of Mechanical Engineering,Taiyuan Institute of Technology,Taiyuan 030008,Shanxi China)

机构地区：[1]太原工业学院机械工程系,山西太原030008

出　　处：《锻压装备与制造技术》2025年第1期129-132,共4页China Metalforming Equipment & Manufacturing Technology

摘　　要：通过多道次热挤压工艺制得含有氧化铝颗粒增强AZ91D镁合金,分析多道次热挤压下Al_(2)O_(3)颗粒增强AZ91D合金力学特性。研究结果表明:通过多道次热挤压处理可以使Al_(2)O_(3)颗粒增强AZ91D合金获得更大硬度。对四道次热挤压处理合金硬度增大至91HV,与一道次热挤压相比硬度显著增大。多道次挤压Al_(2)O_(3)颗粒增强AZ91D合金获得更大拉伸与屈服强度,拉伸强度达到308MPa,屈服强度增大至196MPa。合金断口区域形成众多韧窝结构并出现部分撕裂棱,表现为由韧性断裂作为主导断裂形式。该研究有助于提高镁合金的综合性能,为后续组织强化分析奠定一定的性能基础。AZ91D magnesium alloy reinforced by Al_(2)O_(3) particles was prepared by multi-pass hot extrusion process.The mechanical properties of AZ91D alloy reinforced by Al_(2)O_(3) particles under multi-pass hot extrusion were analyzed.The results show that the hardness of AZ91D alloy reinforced by Al_(2)O_(3) particles can be increased by multi-pass hot extrusion.The hardness of the alloy treated with four hot extrusion increases to 91HV,which is significantly higher than that of one hot extrusion.The tensile strength and yield strength of AZ91D alloy strengthened by multi-pass extrusion of Al_(2)O_(3) particles are higher,the tensile strength reaches 308MPa,and the yield strength increases to 196MPa.Many dimple structures and partial tearing edges are formed in the fracture area of the alloy,which is characterized by ductile fracture as the dominant fracture mode.This study is helpful to improve the comprehensive properties of MG-base alloys and lay a certain foundation for the subsequent microstructure strengthening analysis.

关 键 词：镁合金 挤压道次 颗粒增强 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]