Effects of Nd on microstructure and mechanical properties of as-cast Mg-8Li-3Al alloy were investigated by OM,X-ray diffraction (XRD),EPMA,scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).The results showed that the dendrites sizes of α phase were decreased by the Nd addition.When the amount of addition Nd was 1.6 wt.％,the alloy with the smallest α phase was obtained.The refining mechanism mainly owed to the increasing constitutional supercooling at the solidification front.Furthermore,the compound Al2Nd generated by the reaction of Al and Nd,which distributed at the phase boundary and inside β phase,could also restrain the growth of α phase.Nd could improve the tensile strength and elongation of Mg-8Li-3Al alloy,however,excessive Al2Nd might also become crack source and decrease the elongation.
参考文献
| [1] | Heinz Haferkamp;Rudolf Boehm;Uwe Holzkamp .Alloy Development, Processing and Applications in Magnesium Lithium Alloys[J].Materials transactions,2001(7):1160-1166. |
| [2] | Wang Tao,Zhang Milin,Niu Zhongyi,Liu Bin.Influence of Rare Earth Elements on Microstructure and Mechanical Properties of Mg-Li Alloys[J].稀土学报（英文版）,2006(06):797-800. |
| [3] | 孟祥瑞,巫瑞智,张密林.超轻Mg-Li合金细晶强化与复合强化的研究现状[J].铸造技术,2009(01):116-119. |
| [4] | CAO Peng,ZHANG Milin,HAN Wei,YAN Yongde,WEI Shuquan,ZHENG Tao.Electrochemical behaviour of erbium and preparation of Mg-Li-Er alloys by codeposition[J].稀土学报（英文版）,2011(08):763-767. |
| [5] | Sivakesavam O.;Prasad YVRK. .Characteristics of superplasticity domain in the processing map for hot working of as-cast Mg-11.5Li-1.5Al alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):270-277. |
| [6] | 董含武,吴耀明,王立民.Mg-Li-RE系合金研究进展[J].兵器材料科学与工程,2009(01):88-93. |
| [7] | Liu B;Zhang M L;Wu R Z .Effects of Nd on microstructure and mechanical properties of as-cast LA141 alloys[J].Materials Science and Engineering A,2008,487:347. |
| [8] | 辛明德,吉泽升.稀土元素在铸造镁合金中应用的研究现状及其发展趋势[J].中国稀土学报,2010(06):643-653. |
| [9] | 李明照,李琮,刘旭光,许并社.Nd对AZ31镁合金微观组织与力学性能的影响[J].稀有金属材料与工程,2009(01):7-10. |
| [10] | 李德君,任凤章,刘平,赵士阳,田保红,马战红.稀土Nd对AZ31变形镁合金组织与性能的影响[J].中国有色金属学报,2010(10):1876-1882. |
| [11] | 周海涛,曾小勤,丁文江,马春江,朱燕萍.Effect of La and Nd on microstructures and mechanical properties of AZ61 wrought magnesium alloy[J].中国有色金属学会会刊(英文版),2004(01):67-70. |
| [12] | 许春香,刘彦海,刘方政,吕正林.钕对AZ61镁合金铸态显微组织和力学性能的影响[J].铸造设备与工艺,2009(03):31-32. |
| [13] | 赵源华,陈云贵,唐永柏,肖素芬,牛高,魏尚海,章晓萍.Nd和Ce对AZ91镁合金组织和力学性能的影响[J].特种铸造及有色合金,2009(01):69-72. |
| [14] | 刘生发,王慧源,康柳根,黄尚宇,徐萍.钕对AZ91镁合金铸态组织的影响[J].中国有色金属学报,2006(03):464-469. |
| [15] | 王忠军,张彩碚,崔建忠,乐启炽,邵晓宏,孙跃.铒和钕对铸态ZK60镁合金显微组织和力学性能的影响[J].中国稀土学报,2006(06):710-715. |
| [16] | Hu G X;Cai X;Rong Y H.Foundamentals of Materials Science[M].上海:上海交通大学出版社,2006 |
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