Structure Characterization and Impact Effect of Al-Cu Graded Materials Prepared by Tape Casting

Materials (Basel). 2022 Jul 11;15(14):4834. doi: 10.3390/ma15144834.

Abstract

With the need of developing new materials, exploring new phenomenon, and discovering new mechanisms under extreme conditions, the response of materials to high-pressure compression attract more attention. However, the high-pressure state deviating from the Hugoniot line is difficult to realize by conventional experiments. Gas gun launching graded materials could reach the state. In our work, the corresponding Al-Cu composites and graded materials are prepared by tape casting and hot-pressing sintering. The microstructure and the acoustic impedance of the corresponding Al-Cu composites are analyzed to explain the impact behavior of Al-Cu graded materials. Computed tomographic testing and three-dimension surface profilometry machine results demonstrated well-graded structure and parallelism of the graded material. Al-Cu GMs with good parallelism are used to impact the Al-LiF target at 2.3 km/s using a two-stage light-gas gun, with an initial shock impact of 20.6 GPa and ramping until 27.2 GPa, deviating from the Hugoniot line.

Keywords: Al-Cu composite; acoustic impedance; gas gun experiment; graded materials; interface reflection principle.

Grants and funding

This research was funded National Key R&D Program of China (2021YFB3802300), Key-Area Research and Development Program of Guangdong Province (Grant No. 2021B0707050001), the openly introduced scientific research team (Project No. HJL202202A007), National Natural Science Foundation of China (Grant No. 51932006, 11772312, 11802285).