J4 ›› 2011, Vol. 24 ›› Issue (4): 23-27.

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Effects of Nd and B combined addition on microstructure and mechanical properties of AZ91 magnesium alloy

 ZHAO De-Gang, TIAN Chang-Wen, LIU Yun-Teng, JIANG Li-Kun, ZHAN Cheng-Wei   

  1. Institute of New Materials, Shandong Academy of Sciences, Jinan 250014, China
  • Online:2011-08-20 Published:2011-08-20

Abstract:

        This paper presents the effects of B and Nd combined addition on microstructure and mechanical properties of AZ91 alloy. SEM results show that B and Nd combined addition significantly refines the grain size of α-Mg and β-Mg17Al12  precipitates. Grain refinement is due to the presence of AlB2 particles, nucleants for Mg grains, and Nd addition refines β-Mg17Al12 phases.  Al2Nd and Mg12Nd exist on the intermetallic surface. They have high thermal stability and significantly improve mechanical properties of magnesium alloys. Normal temperature mechanical properties of AZ91 alloys are greatly improved due to grain refinement and the presence of Al2Nd and Mg12Nd.

Key words: magnesium alloy, Boron, Neodymium, microstructure, mechanical property

CLC Number: 

  • TG292