异温轧制制备钛/铝复合板的变形协调性与复合性能

Deformation coordination compatibility and bonding properties of Ti/Al composite plates prepared by different temperature rolling

采取只加热钛层的方法实现协调变形轧制制备钛/铝复合板,通过剪切实验、金相显微镜、扫描电子显微镜,研究压下率、钛层加热温度对钛/铝复合板的厚比分配、剪切强度和界面的影响。结果表明:随着钛层温度的升高和总轧制压下率的增大,钛铝复合板的钛层和铝层变形率差值逐渐减小;当温度为800℃,轧制压下率为50%时,铝层和钛层的变形率分别达到了51.4%和48.6%,钛铝复合板变形趋于协调。钛与铝的结合界面剪切强度达到107.5 MPa,基本接近铝基体的剪切强度。加热过程中钛板表面会产生氧化层,但是在较大轧制压下率下,钛的氧化层会撕裂,金属铝挤入裂缝与新鲜钛金属接触,在强大压力和高温作用下,钛、铝元素相互扩散从而达到牢固的冶金结合。

The Ti/Al composite plate was prepared by the method of only heating titanium layer. The effects of the rolling reduction and Ti layer heating temperature on the shear strength, interface and distribution of thickness ratios of Ti/Al clad plates were investigated by shear experiments, metallographic microscopy and scanning electron microscopy. The results show that with the increase of the temperature of the titanium layer and the total rolling reduction, the difference between the titanium layer and the aluminum layer deformation of the Ti/Al composite plate decreases gradually. When the temperature is 800 ℃ and the reduction is 50%, the reduction of aluminum layer and titanium layer reaches 51.4% and 48.6%, respectively. And the deformation of titanium/aluminum composite plate tends to become coordinated. The interfacial shear strength of titanium and aluminum reaches 107.5 MPa, which is close to the shear strength of aluminum matrix. During the heating process, an oxide layer is produced on the surface of the titanium plates. However, the oxide layer is completely broken with a large rolling reduction, and then, aluminum metal extruded into the cracks and made contact with fresh titanium metal. Under the action of high pressure and high temperature, Ti and Al atoms mutually diffuse so that the Ti/Al clad plates achieved a strong metallurgical bond.