Al-6.5Mg合金的组织与力学性能  

Mechanical Properties and Microstructure of Al-6.5Mg As-cast Alloy

作　　者：樊振中[1] 熊艳才[1] 潘俊杰[1] 杜旭初[1] 罗传彪[1] 李大奎[1] 

机构地区：[1]中国航空工业集团公司北京航空材料研究院,北京市先进铝合金材料及应用工程技术研究中心

出　　处：《特种铸造及有色合金》2015年第8期881-885,共5页Special Casting & Nonferrous Alloys

摘　　要：采用金相电镜、扫描电镜、EDS能谱分析、拉伸性能测试与JMat-Pro材料仿真软件等测试分析手段,研究了Al-6.5Mg合金铸态与退火热处理态下的微观组织与力学性能。结果表明,Al-6.5Mg合金铸态晶粒尺寸约为90μm,平均抗拉强度、屈服强度、伸长率与断面收缩率分别为228 MPa、131.7 MPa、31.9%与39%,铸态断口形貌呈现为典型的韧窝断裂。经500℃×24h与520℃×24h退火热处理后,合金材料的屈服强度、伸长率与断面收缩率保持不变,抗拉强度分别提升了23.2%与24.2%,为281MPa与283MPa,断口形貌仍呈现为韧窝断裂;受退火过程热力学驱动,晶粒内部与晶界处的Mg元素摩尔分数略有增加。The microstructure and mechanical properties of Al-6.5Mg alloy under as-cast and annealed state conditions were investigated by OM,SEM,EDS,tensile testing machine and JMat-Pro software.The results reveal that the grain size of the as-cast alloy reaches 90μm,and the average tensile strength,yield strength,elongation and section shrinkage reach 228 MPa,131.7 MPa,31.9% and 39%,respectively.Meanwhile,fracture morphology is characterized by the typical dimple fracture.After annealing at 500 ℃ and 520 ℃for 24 h,respectively,the yield strength,elongation and section shrinkage exhibit stable,however,the tensile strength is improved by 23.2% and by 24.2%,respectively,reaching 281 MPa and 283 MPa.In addition,the fracture morphology is still presented as the dimple fracture.Driving by the thermodynamics in the annealing process,the EDS scanning atomic percentage of Mg element distributed in the grain interior and grain boundary are increased slightly.

关 键 词：铝镁合金 力学性能 微观组织 材料仿真计算 

分 类 号：TG146.21[一般工业技术—材料科学与工程]