论文部分内容阅读
在室温条件下,通过叠轧方法制备了Ti/Al七层复合板,并在不同温度下进行了退火处理。采用光学显微镜观察了复合板界面的连接质量,利用扫描电镜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。
At room temperature, the Ti / Al seven-layer composite plate was prepared by the roll-bonding method and annealed at different temperatures. The connection quality of composite plate was observed by optical microscope. The element diffusion behavior at Ti / Al interface of the composite plate under different annealing temperature was studied by scanning electron microscope. The mechanical properties of the original plate and composite plate were studied by tensile test. The results show that the rolling reduction has a significant effect on the deformation uniformity and interface structure of the plate. When the rolling reduction is 60%, the bonding quality of the composite plate is good and the layered structure is complete. When the rolling reduction of 70%, Ti layer locally cracked, so that both sides of the aluminum layer connected, can not maintain the layered structure. With the increase of annealing temperature, the diffusion distance of Ti and Al elements at Ti / Al interface increased, the diffusion distance of Al element was larger than the diffusion distance of Ti element, and a small amount of second phase was formed. Ti / Al composite plate yield strength between the original titanium plate and the original aluminum yield strength, higher than the calculated value mixed law, the elongation lower than the original plate, and with the strain rate increases, the yield strength of the composite plate and tensile Increased strength.