Influence of Neodymium on Eutectic Behavior of AZ91 Magnesium Alloys at Different Cooling Rates
Two kinds of magnesium alloys, AZ91 magnesium alloy and AZ91 magnesium alloy modified by 1. Owt.％ neodymium (AZ91Nd) , were prepared using permanent mold cast under the same foundry technique, respectively. The microstructures and the phrases of the AZ91 and AZ91 Nd magnesium alloys at different cooling rates were observed systemically by scanning electron microscopy and X-ray diffraction. The results indicated that both the high cooling rates and the proper addition of the neodymium significantly promoted a series of transitions from the granular eutectic to the partially divorced, and finally to the fully divorced eutectic. Furthermore, the eutectic morphologies of the AZ91 Nd magnesium alloy were generally at least one stage further towards the fully divorced eutectic compared with those of the AZ91 magnesium alloy at the same cooling rates. The effects of neodymium on the eutectic morphologies of the AZ91 magnesium alloys were mAlnly attributed to decreasing the sizes of the primary grAlns and promoting development of the secondary and tertiary arms of the a-Mg grAlns. This research is to provide some credible results for accurately controlling the solidification process and consequently optimizing the microstructures of magnesium alloys.
Magnesium alloys Neodymium Eutectic solidification Microstructure
Song Yulai Liu Yaohui Wang Qiang
Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science & Engineering, Jilin University, Changchun 130025, China
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
846-849
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）