吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (5): 1542-1547.doi: 10.13229/j.cnki.jdxbgxb201705028

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Synthesis microstructure and thermal properties of high performance bulk Al

TANG Hua-guo1, 2, 3, MA Xian-feng1, 2, ZHAO Wei1, 2, LIU Jian-wei1, 2, ZHAO Zhen-ye1, 2   

  1. 1.Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130021, China;
    2.State Key Laboratory of Rare Earth Resource Utilization, Chinese Academy of Sciences, Changchun 130021, China;
    3.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-05-10 Online:2017-09-20 Published:2017-09-20

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Abstract:

Heat resistant bulk Al was prepared by mechanical milling, cold isostatic pressing and press-forming technique. The bulk Al possesses stable microstructure, with grain size between 0.6 and 4 μm, and the ultimate tensile strength, 536 MPa, surpasses that of most commercial Al alloys, especially at high temperature. The heat exposure experiment was carried out at 200 ℃, 300 ℃ and 350 ℃ for 4320 h. The high temperature endurance strength is 381 MPa, 242 MPa and 178 MPa corresponding to 200 ℃, 300 ℃ and 350 ℃ respectively. The pinning action of the second-phase dispersoids in bulk Al highly restrains grain growth during the process of hating.

Key words: metallic materials, bulk ultrafine Al, mechanical milling, press-forming, thermal stability

CLC Number: 

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