Affiliation:
1. Henan Key Laboratory of Nonferrous Materials Science and Processing Technology Henan University of Science and Technology Luoyang 471023 Henan China
2. Henan Key Laboratory of Advanced Conductor Materials, Institute of Materials Henan Academy of Sciences Zhengzhou 450052 China
3. Provincial and Ministerial Co‐construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology Luoyang 471023 Henan China
Abstract
In this work, it is aimed to improve the deformation ability of the Al2O3 dispersion strengthened copper sintered billet by building heterogeneous structure with addition of different sizes of particle. Using the modified mixture model and equal work law, the stress distribution model of heterogeneous materials is derived. In the results, it is shown that higher deformation temperature and lower strain rate are conducive to steady deformation. Under the conditions of 950 °C and 0.01 s−1, the stress distribution coefficients from low to high are 10, 25, and 5 μm, respectively, when the strain is 0.1. The strain contribution rates of softness of the sintered billet are 45.5%, 62.1%, and 42.6%, respectively. The addition of 10 μm particle size copper powder can significantly improve the deformation capacity of the sintered billet. It is found that with the increase of the particle size of copper powder, the density of the microgeometrically necessary dislocation of the hot extrusion dispersed copper is lower. The reason is that the different particle size of copper powder leads to the different distribution in powder stacking, which affects the difficulty of harmonizing the deformation of soft and hard and the number of dislocation in the hot‐extrusion process of sintered billet.
Funder
China Postdoctoral Science Foundation