欢迎登录材料期刊网

材料期刊网

高级检索

采用Si-RE元素对AZ31镁合金进行复合微合金化,利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)及拉伸实验仪等手段研究Si-RE元素对AZ31镁合金的微观组织和力学性能的影响规律。结果表明,Si-RE复合加入可以明显细化AZ31镁舍金的铸态组织,β-Mg17A112相也由网状分布变为颗粒状,同时生成了短棒状和针状的Mg。Si相及A111,RE3相;合金的综合力学性能显著改善,AZ31+0.49/5Si+0.5%RE的强度和延伸率比原始AZ31镁合金分别提高了42MPa和3.9%,试样室温拉伸断口虽然是以解理为主的脆性断裂,但断口中出现了少量的韧窝,解理面也较小。

The effects of Si-RE on the microstructure and mechanical properties of AZ31magnesium alloy were investigated. The phase present in the alloys have been identified by optical metallography(OM), scanning elec- tron microscopy(SEM) /energy dispersive X-ray spectroscopy(EDS) and X-ray diffractometer (XRD). And the mechanical properties have also been measured by material test machine at room temperature. The results show that he microstructure is obviously refined and the tensile strength of AZ31 based alloy at room temperature is significantly improved. Compared to AZ31, the tensile of AZ31 0.4%Si 0.5%RE alloy has higher ultimate ten sile strength and elongation. Its ultimate tensile strength and elongation are enhanced by 42MPa and 3.9%, re- spectively. Although addition alloy elements can't change the fracture mode of AZ31, SEM fractographs of ten- sile fracture surface have obvious plastic deformation. It indicates that has had the bigger plastic deformation before failure.

参考文献

[1] Mordike B L;Ebert T .Magnesium properties-applica- tion-potential[J].Materials Science and Engineering,2001,A302(01):37-45.
[2] E. Aghion;B. Bronfin;D. Eliezer .The role of the magnesium industry in protecting the environment[J].Journal of Materials Processing Technology,2001(3):381-385.
[3] Kitazono K;Sato E;Kuribayashi K .Internal stress su- perplasticity in polycrystalline AZ31 Mg alloy[J].Scrip- ta Materialia,2001,44(12):2695-2702.
[4] Stanford N. Micro-alloying Mg;Y, Ce .Gd and La for texture modification-a comparative study[J].Materials Science and Engineering,2010,A527(10-11):26692677.
[5] Masoudpanah, S.M.;Mahmudi, R. .Effects of rare earth elements and Ca additions on high temperature mechanical properties of AZ31 magnesium alloy processed by ECAP[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(16/17):3685-3689.
[6] Wang Qiang;Gao Jiacheng;Li Wei et al.Microstruc- ture and mechanical properties of novel niomedical alloy Mg-4Y-gNd-Zr[J].Journal of Functional Materials,2008,39(10):1717-1719.
[7] 夏兰廷,李宏战,高珊,师素粉.Cd对AZ31镁合金铸态组织和力学性能的影响[J].铸造,2008(10):1068-1071.
[8] Cahn R W;Haasen P.Physical metallurgy[M].New York:North-Holland Publishing,1983
[9] Du W W;Sun Y S;Min X G et al.Microstructure and mechanical properties of Mg-A1 based alloy with calcium and rare earth additions[J].Materials Science and Engi neering,2003,A 356(1-2):1-7.
[10] 余永宁.材料科学基础[M].北京:高等教育出版社,2006
[11] Nayeb-Hshemi A A;Clark J B.Phase diagrams of bina ry magnesium alloys[M].Ohio:ASM International,1998
[12] 闵学刚,孙扬善,杜温文,薛烽.Ca,Si和RE对AZ91合金的组织和性能的影响[J].东南大学学报(自然科学版),2002(03):409-414.
[13] Zhang Guoying,Zhang Hui,Gao Ming,Wei Dan.Mechanism of Effects of Rare Earths on Microstructure and Properties at Elevated Temperatures of AZ91 Magnesium Alloy[J].稀土学报(英文版),2007(03):348-351.
[14] Jiang QC;Wang HY;Wang Y;Ma BX;Wang JG .Modification of Mg2Si in Mg-Si alloys with yttrium[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):130-135.
[15] Asl K M;Tari A;Khomamizadeh F .The effect of dif- ferent of AI,RE and Si element on the microstructure,mechanical and creep properties of Mg-A1 alloys[J].Materials Science and Engineering,2009,A 523(1-2):1-6.
[16] Nussbaum G;Sainfort P;Regazzoni G et al.Strength- ening mechanisms in the rapidly solidified AZ 91 magne- sium alloy[J].Scripta Metallurgica,1989,23(07):1079-1084.
[17] 闵学刚 .几种合金元素对改善AZ91合金显微组织和力学性能的作用的研究[D].东南大学,2002.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%