Meng Linggang, Zhou Bingwen, Ya Bin, Jing Dong, Jiang Yingxi, Zhang Danning, Zhang Xingguo
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
Materials (Basel). 2020 Sep 5;13(18):3932. doi: 10.3390/ma13183932.
AlMgTi-based metal-intermetallic laminated composites were successfully fabricated through an innovative dual-step vacuum hot pressing. First, this study prepares the AlTi-based laminated composites by vacuum hot pressing at 650 °C. Then, the researchers place the Mg-Al-1Zn (AZ31) magnesium alloy between the prepared AlTi-based laminated composites at 430 °C for hot pressing. This study investigates the microstructure, phase composition, and microhardness distribution across interfaces of the intermetallics and metal. A multilayer phase (MgAl, AlMg, and transition layers) structure can be found from the diffusion layers between Al and AZ31. The microhardness of the material presents a wavy distribution in the direction perpendicular to the layers; the maximum can be up to 600.0 HV0.2 with a minimum of 28.7 HV0.2 The microhardness gradient of an AlMgTi-based composite is smoother due to the different microhardness of the layers, and reduces the interface stress concentration. The bending strength of AlMgTi-based composites can reach 265 MPa, and the specific strength is 105 × 10 Nm/kg, higher than AlTi-based composites.
通过创新的两步真空热压工艺成功制备了铝镁钛基金属间化合物层状复合材料。首先，本研究通过在650℃下真空热压制备铝钛基层状复合材料。然后，研究人员在430℃下将Mg-Al-1Zn（AZ31）镁合金置于制备好的铝钛基层状复合材料之间进行热压。本研究调查了金属间化合物与金属界面的微观结构、相组成和显微硬度分布。在铝与AZ31之间的扩散层中可发现多层相（MgAl、AlMg和过渡层）结构。材料的显微硬度在垂直于层的方向上呈现波浪状分布；最大值可达600.0 HV0.2，最小值为28.7 HV0.2。由于各层显微硬度不同，铝镁钛基复合材料的显微硬度梯度较为平缓，降低了界面应力集中。铝镁钛基复合材料的抗弯强度可达265 MPa，比强度为105×10 Nm/kg，高于铝钛基复合材料。
