累积叠轧Mg/Ti复合板的微观组织与力学性能  

Microstructure and mechanical properties of Mg/Ti laminated composites fabricated by accumulative roll bonding

作　　者：唐意智 何维均[1] 蒋斌[1] TANG Yi-zhi;HE Wei-jun;JIANG Bin(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《材料热处理学报》2023年第10期59-67,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52171102)。

摘　　要：相较于钛合金、钢等结构材料,镁(Mg)及其合金的绝对强度较低、塑性相对较差,阻碍了其广泛应用。层状复合材料能结合不同金属的优异性能,近年来被广泛应用于提高镁合金的综合性能。在本项研究中,通过累积叠轧法(ARB)制备了Mg/Ti层状复合材料,利用光学显微镜、扫描电镜以及电子背散射衍射等分析了其在不同道次轧制条件下的微观组织,利用单向拉伸和数字图像相关(DIC)技术对Mg/Ti复合材料的力学性能和变形行为进行了分析。结果表明,进行了一次ARB后,Mg/Ti复合材料具有优异的综合性能,这归功于应变硬化和良好的层间结合强度。继续进行更多道次的ARB,Mg/Ti复合材料的屈服强度、抗拉强度和断裂伸长率明显下降,这与Ti层不再连续分布有关。Compared to structural materials such as titanium alloys and steel,magnesium(Mg)and its alloys have lower absolute strength and relatively poor plasticity,which hinders their widespread application.Laminated composites can combine the excellent properties of different metals and have been widely used in recent years to improve the comprehensive properties of magnesium alloys.In this study,Mg/Ti laminated composites were prepared by the accumulative roll bonding(ARB),and microstructure of the composites after ARB for different passes was analyzed by means of optical microscope,scanning electron microscopy and electron backscatter diffraction technique.The mechanical properties and deformation behavior of the Mg/Ti composites were analyzed using uniaxial tensile and digital image correlation(DIC)technique.The results show that after one ARB pass,the Mg/Ti composites exhibit excellent comprehensive properties,which is attributed to strain hardening and good interlayer bonding strength.Continuing with more ARB passes,the yield strength,tensile strength and elongation of the Mg/Ti composites significantly decrease,which is related to the discontinuous distribution of Ti layers.

关 键 词：累积叠轧 Mg/Ti复合材料 微观组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]