Metals and Materials International ( IF 3.5 ) Pub Date : 2021-01-23 , DOI: 10.1007/s12540-020-00928-x Fu-xiang Cao , Kun-kun Deng , Cui-ju Wang , Kai-bo Nie , Wei Liang , Jian-feng Fan
Abstract
The 10 μm 10 vol% SiCp/2024Al composites sheet was successfully fabricated by semi-solid stir casting followed with two-step deformation (extrusion and rolling). The two-step thermal deformation solves the sheet rolling formability of the SiCp/2024Al composites produced by stir casting. Compared with the SiCp/2024Al composites prepared by traditional powder metallurgy, this paper innovatively studied the synergistic enhancement between CuAl2 phase and SiCp on the mechanical properties. The result shows that the two-step deformation can significantly improve the uniformity of the distribution of SiCp and CuAl2 phases. At the same time, the average size of the SiCp and CuAl2 phase decreases after the two-step deformation. During the hot extrusion, SiCp has an obvious hindrance to the refinement of the CuAl2 phase. Moreover, the SiCp/2024Al composites sheet exhibits excellent yield strength (295 MPa), ultimate tensile strength (489 MPa), and elongation (10.42%). The performance improvement of SiCp/2024Al after two-step thermal deformation is mainly attributed to the improved interface bonding strength of SiCp-2024 Al matrix, the refined SiCp and the more uniform distribution of SiCp.
Graphic abstract
中文翻译:
两步变形协同铸造SiC p / 2024Al复合材料的强度-延性协同增强
摘要
通过半固态搅拌铸造并随后进行两步变形(挤压和轧制),成功制造了10μm10 vol%SiC p / 2024Al复合材料片材。两步热变形解决了通过搅拌铸造生产的SiC p / 2024Al复合材料的薄板轧制成形性。与传统粉末冶金法制备的SiC p / 2024Al复合材料相比,本文创新性地研究了CuAl 2相与SiC p在力学性能上的协同增强作用。结果表明,两步变形可以显着提高SiC p和CuAl 2的分布均匀性阶段。同时,经过两步变形后,SiC p和CuAl 2相的平均尺寸减小。在热挤压,碳化硅p具有明显的阻碍到的CuAl的细化2相。此外,SiC p / 2024Al复合片材具有优异的屈服强度(295 MPa),极限抗拉强度(489 MPa)和伸长率(10.42%)。SiC的性能改善p后两步热变形/ 2024Al主要归因于SiC的改进的界面粘合强度p -2024 Al基体中,所述精制的SiC p和SiC的更均匀的分布p。