Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (12): 1719-1723.DOI: 10.12068/j.issn.1005-3026.2015.12.011

• Materials & Metallurgy • Previous Articles     Next Articles

Effects of Rare Earth La on Mechanical Properties of Casting AlSi10Cu0.2Mg0.2Mn and ZnAl12Cu1(Mg) Alloys

JANG Pok-nam1, 2, LI Hyon-mo2, WANG Zhao-wen1   

  1. 1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China; 2.Kim Chaek University of Technology, Pyongyang 999093, D. P. R of Korea.
  • Received:2015-03-13 Revised:2015-03-13 Online:2015-12-15 Published:2015-12-07
  • Contact: JANG Pok-nam
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Abstract: AlSi10Cu0.2Mg0.2Mn-xLa and ZnAl12Cu1(Mg)-xLa casting alloy were prepared by Al-La master alloy. The effect of La content on the microstructure, tensile strength, elongation and impact strength of these alloys were investigated. The results indicated that the crystalline grain of alloys could be refined by addition of La element and the size and shape of Si phase particle were also modified. Compared with the previous alloys, the mechanical properties of AlSi10Cu0.2Mg0.2Mn-xLa alloy and ZnAl12Cu1(Mg)-xLa alloy containing traces of La were relatively improved. When 0.15wt% of La was added in AlSi10Cu0.2Mg0.2Mn casting alloy, the elongation could increase to 2.7 times. The tensile strength and elongation of ZnAl12Cu1(Mg)-xLa containing 0.1wt% of La was increased to 1.3 and 3.2 times, respectively. The hardness of ZnAl12Cu1(Mg)-xLa containing 0.3wt% of La was increased to 1.8 times while ZnAl12Cu1(Mg)-xLa containing 0.15wt% of La exhibited the maximum impact strength. Comprehensively considering the mechanical properties of ZnAl12Cu1(Mg)-xLa casting alloy, the optimal addition content of La was controlled in the range of 0.1wt%~0.2wt%.

Key words: rare earth La, Al-La master alloy, cast Al alloy, cast Zn alloy, mechanical property

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