采用氩气保护的方法制备了Mg-6Al-2Sr-xY镁合金,研究了钇含量对该合金显微组织和力学性能的影响,探讨了锶和钇在合金中的存在形式.结果表明:加入适量的钇能使该合金的铸态显微组织明显细化,锶和钇在合金中主要以Al_4Sr、Al_2Y和Al_3Y形态存在,Al_4 Sr相呈骨骼状分布于晶界处,Al_2Y和Al_3Y呈颗粒状主要在晶内析出;合金的力学性能随着钇含量的增加呈现先上升后下降的趋势,当钇质量分数为1.5%时,与Mg-6Al-2Sr镁合金相比,该合金的抗拉强度提高了20.6%,屈服强度提高了24.6%,伸长率提高了52.9%.
A series of Mg-6Al-2Sr-xY magnesium alloys were prepared under the protection of argon atmosphere. The effect of Y content on microstructure and mechanical properties of Mg-6Al-2Sr-xY was studied and the existing forms of Y and Sr in the alloy were discussed. The results indicate that the proper addition of Y resulted in the refinement of Mg-6Al-2Sr-xY alloy microstructure. Sr and Y exsited in the forms of Al_4 Sr, Al_2 Y and Al_3 Y phase. Net-like Al4 Sr phase was distributed along the grain boundary and particle-like or acicular Al-Y phase was mainly precipitated from the grain. The mechanical properties of the alloys initially ascended and then descended with the increase of Y addition. When Y content was 1.5wt%, compared with Mg-6Al-2Sr alloy, the tensile strength of the alloy was improved by 20. 6%, yield strength was increased by 24. 6% and the elongation was enhanced by 52. 9%.
参考文献
| [1] | 姚素娟,张英,褚丙武,梁冬梅.镁及镁合金的应用与研究[J].世界有色金属,2005(01):26-30. |
| [2] | X. Tian;L.M. Wang;J.L. Wang .The microstructure and mechanical properties of Mg-3Al-3RE alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):412-416. |
| [3] | 刘相果,彭晓东,谢卫东,魏群义.金属锶及其合金的研究现状与应用[J].稀有金属,2004(04):750-755. |
| [4] | A. SUZUKI;N.D. SADDOCK;L. RIESTER .Effect of Sr Additions on the Microstructure and Strength of a Mg-Al-Ca Ternary Alloy[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2007(2):420-427. |
| [5] | 刘方政,许春香,刘彦海,吕正玲.Y对AZ61镁合金金相组织和力学性能的影响[J].铸造设备研究,2008(01):15-17. |
| [6] | 刘宏伟,罗承萍,刘江文.钇及混合稀土对镁铝锌合金组织与性能的影响[J].特种铸造及有色合金,2003(05):14-17. |
| [7] | V. Neubert;I. Stulikova;B. Smola;B.L. Mordike;M. Vlach;A. Bakkar;J. Pelcova .Thermal stability and corrosion behaviour of Mg–Y–Nd and Mg–Tb–Nd alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1-2):329-333. |
| [8] | 李建辉,杜文博,吴玉锋,左铁镛.Mg-6Al-2Sr-xNd镁合金的显微组织和力学性能[J].特种铸造及有色合金,2007(06):482-484. |
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