叠轧Ti/Al复合板结构与力学性能研究  

Structure and Mechanical Properties of Ti/Al Multilayered Composite

作　　者：董晓萌[1] 任学平[1] 王耀奇[2] 侯红亮[2] 程玉洁[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京航空制造工程研究所金属成形技术研究室,北京100024 [3]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《稀有金属》2017年第11期1208-1213,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51205376)资助

摘　　要：在室温条件下,通过叠轧方法制备了Ti/Al 7层复合板,并在不同温度下进行了退火处理。采用光学显微镜(OM)观察了复合板界面的连接质量,利用扫描电镜(SEM)研究了不同退火温度下复合板Ti/Al界面处的元素扩散行为,并通过拉伸试验研究了原始板材与复合板的力学性能。研究结果表明,轧制压下量对板材变形均匀性及界面结构影响显著,当轧制压下量为60%时,复合板结合质量良好,层状结构完整。当轧制压下量为70%时,Ti层局部产生开裂,使两侧铝层相连,不能保持层状结构。随着退火温度的升高,Ti/Al界面处Ti,Al元素扩散距离增加,Al元素扩散距离大于Ti元素的扩散距离,并有少量的第二相生成。Ti/Al复合板的屈服强度介于原始钛板与原始铝板屈服强度之间,高于混合定律计算值,延伸率低于原始板材,并且随着应变速率的增加,复合板材屈服强度及抗拉强度提高。Seven-layer Ti/Al multilayered composites were prepared by rolling at ambient temperature, and then were annealed at different temperatures. The bonding quality of the layers was investigated by optical microscope （OM）. The interdiffusion of Ti and Al on the interfaces of Ti/Al multilayered composite at different annealing temperatures was studied using scanning electron microscope （SEM）. The mechanical properties of the initial sheets and the multilayered composite were evaluated through conducting tensile tests on a universal mechanical testing machine. The results showed that the deformation uniformity and interracial structure were affected significantly by thickness reduction. Good bonding quality and intact lamella structure were obtained when the thickness reduction of the initial sheets was 60%. However, when the thickness reduction was 70% , the Ti layers were locally broken and Al layers were partially connected, resulting in incomplete layers. The diffusion distances of Ti and Al at the interfaces increased with the annealing temperature increasing, while the former was shorter than the later, accompanied with the formation of a bit of second phase. The yield stress of the Ti/Al composite was between that of the initial Ti and Al sheets, and was also higher than that calculated by the mixture law. However, the elongation of the composite was notably decreased. Besides, the yield stress and tensile stress of the Ti/Al muhilayered composite increased with the strain rates increasing.

关 键 词：叠轧 钛铝复合板 界面 屈服强度 应变速率敏感 

分 类 号：TG339[金属学及工艺—金属压力加工]