Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (3): 333-337.DOI: 10.12068/j.issn.1005-3026.2016.03.007

• Materials & Metallurgy • Previous Articles     Next Articles

Evolution of Morphological Character of Al4Sr Phase Under Different Solidification Conditions

LI Lei, XU Si-yang, ZHANG Hai-tao, CUI Jian-zhong   

  1. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China.
  • Received:2014-07-22 Revised:2014-07-22 Online:2016-03-15 Published:2016-03-07
  • Contact: LI Lei
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Abstract: Al-20 Sr intermediate alloys were prepared by both mold and suction castings. The morphological evolution of the primary Al4Sr phase under different solidification conditions was investigated by SEM. The results showed that in the mold cast specimens the primary Al4Sr phases are regular and complete block-like shape at 850℃ and are strip-like form with obvious preferential crystallographic growth character at 950℃. In the suction cast specimens, the primary Al4Sr phases are regular and complete block-like shape when the temperature is increased to 850℃, fine bamboo-like shapes in the central and short strip-like and elliptical forms in the peripheral regions when the temperatures are increased to 900℃ and 950℃ and then decreased to 900℃, coarse and fine stripe-like shapes when the temperatures are decreased to 850℃ and 800℃, and coarse stripe-like forms when the temperature is decreased to 750℃, respectively. In summary, solidification conditions have important influence on the morphologies of Al4Sr phase.

Key words: Al-Sr intermediate alloy, mold casting, suction casting, Al4Sr phase, morphological character

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