Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (10): 37-43.

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Microstructure and Wear Properties of AI-Based Bearing AlIoys Fabricated by Mechanical AIIoying

Zhu Min  Zeng Mei-qin  Ouyang Liu-zhang  Wu Zhi-fang  Liu Xin   

  1. School of Mechanical Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2007-04-11 Online:2007-10-25 Published:2007-10-25
  • Contact: 朱敏(1962-) ，男，教授，博士生导师，主要从事金属材料的研究. E-mail:memzhu@scut. edu.cn
  • About author:朱敏(1962-) ，男，教授，博士生导师，主要从事金属材料的研究.
  • Supported by:

    国家自然科学基金资助项目(50371027) ;广东省自然科学基金团队项目

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Abstract:

AI-Pb and AI-Sn bearing alloys were obtained by sintering the AI-Pb and AI-Sn powder mixtures preparedvia mechanical alloying. According to the microstructures of the alloys characterized by means of XRD , SEMand TEM , the Pb or Sn soft phase in a size of about 100 nm homogeneously disperses in AI matrix of the alloys fabricatedunder appropriate mechanical alloying and sintering conditions. It is indicated by the wear test that the AIbasedbearing alloys containing nano-sized Pb or Sn dispersoids are of excellent wear properties. Moreover , accordingto the coarsening behavior of the nanophase particles , the nano-composite structure possesses good stability andthe growth of the second phase still follows the classical ripening theoηdescribed by LSW equation. As for theeffect of the contamination induced by milling on the microstructure of Al-based bearing alloys , the Al7 Cu2 Fe phaseforms owing to the Fe contamination , and the adherence of nano-sized Al2 O3  phase to Pb particles occurs due to theoxygen contammatlOn.

Key words: mechanical alloying, Al-based bearing alloy, nano-composite structure, wear property