17Al12中。Ce可使α-Mg晶粒有一定程度的細化,其在結(jié)晶前沿富集所造成的成分過冷是晶粒細化的主要原因；Ce可以減少參與共晶反應的Al,使得β-Mg17Al12數(shù)量減少并且使其分布由晶界處連續(xù)變?yōu)殡x散；Zn離子置換Al離子導致β-Mg17Al12晶格發(fā)生畸變,晶格常數(shù)變大。"/>

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含鈰AZ91鎂合金中合金元素分布和化合物結(jié)構(gòu)研究
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內(nèi)蒙古工業(yè)大學 材料科學與工程學院

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TG115.5

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國家自然科學基金(51661025)和內(nèi)蒙古自治區(qū)自然科學基金(2013ZD10)資助


Study on alloying element distribution and compound structure of AZ91 magnesium alloy with Ce
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Inner Mongolia University of Technology,Materials science and Engineering

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    摘要:

    制備不同Ce含量的AZ91鎂合金,在分析合金顯微組織變化的基礎上,對合金元素分布和化合物結(jié)構(gòu)進行研究,以探討合金組織變化的原因。結(jié)果表明：Ce在α-Mg中的固溶量僅為幾十個ppm,Al在α-Mg中的固溶量小于其在合金中的平均含量,Zn主要存在于β-Mg17Al12中。Ce可使α-Mg晶粒有一定程度的細化,其在結(jié)晶前沿富集所造成的成分過冷是晶粒細化的主要原因；Ce可以減少參與共晶反應的Al,使得β-Mg17Al12數(shù)量減少并且使其分布由晶界處連續(xù)變?yōu)殡x散；Zn離子置換Al離子導致β-Mg17Al12晶格發(fā)生畸變,晶格常數(shù)變大。

    Abstract:

    AZ91 magnesium alloys with different Ce content were prepared, and the distribution of alloy elements and compounds structure were studied on the basis of analyzing the microstructure of the alloy, in order to investigate the reason of the change of the structure of the alloy. The results show that The solid solution of Ce in a -Mg is only a few dozen ppm, and the amount of solid solution of Al in a -Mg is less than the average content in the alloy, while Zn mainly exists in the β-Mg17Al12. The grain size decreases with increasing the Ce content, and the Ce is gather in front of solid/liquid interface lead to form composition under-cooling which cause the grain refinement. Ce can reduce the amount of Al participated in the eutectic reaction which make β-Mg17Al12 decrease and its distribution from continuous to discrete. Zn ion replacement Al ion results in lattice distortion of β-Mg17Al12 and the lattice constant increase.

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蘇娟,郭鋒,蔡會生,劉亮,陳寶東.含鈰AZ91鎂合金中合金元素分布和化合物結(jié)構(gòu)研究[J].稀有金屬材料與工程,2018,47(11):3409~3413.[Su Juan, Guo Feng, Cai Huisheng, Liu Liang, Chen Baodong. Study on alloying element distribution and compound structure of AZ91 magnesium alloy with Ce[J]. Rare Metal Materials and Engineering,2018,47(11):3409~3413.]
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  • 收稿日期:2017-03-14
  • 最后修改日期:2017-05-05
  • 錄用日期:2017-05-15
  • 在線發(fā)布日期: 2018-12-19
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