Luo Wenbo, Feng Yunzhe, Xue Zhiyong, Kong Qinke, Han Xiuzhu
Institute for Advanced Materials, North China Electric Power University, Beijing 102206, China.
Beijing Institute of Spacecraft System Engineering, Beijing 100094, China.
Materials (Basel). 2022 Apr 11;15(8):2805. doi: 10.3390/ma15082805.
Mg-(Al-)Ti laminated sheets with large bonding interfaces were prepared by a differential temperature hot-rolling process, in which the preheating treatment of Ti was 25-100 °C higher than that of Mg. The rolled sheets contained different Al layer thicknesses (≤0.05 mm), and the thickness of the diffused region at the interface of 3-7 μm was formed by rolling at 175 °C. The interfaces were the solid-solution regions of Mg(Al) and Ti(Al), and no intermetallic compounds were generated during both the rolling process and annealing treatment. The hardness of the interfaces was 16-30% greater than that of the Mg matrix and Ti matrix. The results of mechanical tests displayed that the Mg-(Al-)Ti sheets exhibited higher strength and elastic modulus compared to those of the rolled AZ31B sheet. Their UTS and YTS were about 223-460 MPa and 303-442 MPa, respectively, with an elongation of 0.04-0.17 and high elastic modulus of 52-68 GPa. The Mg-Ti (containing about 62 at.% Mg) rolled sheet exhibited the most excellent strength. The UTS and YTS were about 460 MPa and 442 MPa, with an elongation of 0.04 and elastic modulus of 61.5 GPa. Additionally, Mg-Ti sheets with thin Ti thickness possessed a higher work-hardening rate (), as well as hardening rate, than the rolled Mg-Al-Ti sheets. This is because fractured Ti pieces around the interfaces have a significant strengthening effect. This study provides a simple method for fabricating Mg-(Al-)Ti sheets with high elastic modulus.
通过差温热轧工艺制备了具有大结合界面的Mg-(Al-)Ti层压板材，其中Ti的预热处理温度比Mg高25-100°C。轧制板材包含不同厚度（≤0.05mm）的Al层，在175°C轧制时在界面处形成了3-7μm厚的扩散区域。界面是Mg(Al)和Ti(Al)的固溶区，在轧制过程和退火处理过程中均未生成金属间化合物。界面硬度比Mg基体和Ti基体高16-30%。力学测试结果表明，与轧制的AZ31B板材相比，Mg-(Al-)Ti板材具有更高的强度和弹性模量。它们的抗拉强度和屈服强度分别约为223-460MPa和303-442MPa，伸长率为0.04-0.17，弹性模量高达52-68GPa。Mg-Ti（含约62at.%Mg）轧制板材表现出最优异的强度。其抗拉强度和屈服强度分别约为460MPa和442MPa，伸长率为0.04，弹性模量为61.5GPa。此外，Ti厚度较薄的Mg-Ti板材比轧制的Mg-Al-Ti板材具有更高的加工硬化率以及硬化速率。这是因为界面周围破碎的Ti片具有显著的强化作用。本研究提供了一种制备具有高弹性模量的Mg-(Al-)Ti板材的简单方法。
