利用往复挤压（RE-n,n为挤压道次）制备Mg-4Al-2Si（AS42）、Mg-4Al-4Si（AS44）和Mg-6Al-6Si（AS66）合金,并在150℃和1.33×10-3s-1的初始应变速率下测试合金的拉伸性能。结果表明：RE-8-AS42合金晶粒尺寸为2.1μm,Mg2Si颗粒尺寸为1.3μm;RE-4-AS42合金晶粒尺寸为4.8μm,组织中含有2～20μm的大块Mg2Si颗粒;RE-AS44和RE-AS66合金晶粒尺寸约为11μm,组织中存在〉20μm的Mg2Si颗粒。合金拉伸强度随挤压道次增加而提高,RE-8-AS42合金性能最佳,抗拉强度、屈服强度和伸长率分别为250 MPa、197 MPa和62%,高的性能归因于细小的晶粒和阻碍晶界滑移的细小稳定Mg2Si颗粒。
Mg-4Al-2Si（AS42）,Mg-4Al-4Si（AS44） and Mg-6Al-6Si（AS66） alloys were prepared by reciprocating extrusion（RE-n,where n is pass number）,and tensile properties of the alloys were examined at 150 ℃ with an initial strain rate of 1.33 × 10-3 s-1.The results show that the grain size of RE-8-AS42 alloy with Mg2Si particles of 1.3 μm is 2.1 μm,the grain size of 4.8 μm is observed in RE-4-AS42 alloy containing Mg2Si particles of 2-20 μm,and the grain sizes of RE-AS44 and RE-AS66 alloys are about 11 μm containing Mg2Si particles larger than 20 μm.The tensile strength increases with increasing extrusion passes.The RE-8-AS42 alloy has the best tensile properties with an ultimate tensile strength,a yield strength and an elongation of 250 MPa,197 MPa and 62%,respectively.The excellent properties are attributed to the fine grains and thermally stable fine Mg2Si particles,which can suppress grain boundaries sliding effectively.
参考文献
| [1] | Hong T K;Terry O .Mechanial behavior of cast and forged magnesium alloys and their microstructures[J].Materials Science and Engineering A,2008,490:52-56. |
| [2] | Spigarelli S .Constitutive equations in creep of Mg-Al alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):153-160. |
| [3] | Kaveh Meshinchi Asl;Alireza Tari;Farzad Khomamizadeh .The effect of different content of Al, RE and Si element on the microstructure,mechanical and creep properties of Mg-Al alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2009(1/2):1-6. |
| [4] | Spigarelli S;Ciccarelli D;Evangelista E .Compressive deformation of an Mg-Al-Si-RE alloy between 120 and 180℃[J].Materials Letters,2004,58(3-4):460-464. |
| [5] | FANG Xiya,YI Danqing,WANG Bin,WU Chunping,ZHANG Hong.Hot compression deformation behavior of the Mg-AI-Y-Zn magnesium alloy[J].稀有金属（英文版）,2008(02):121-126. |
| [6] | Szczech, JR;Jin, S .Mg2Si nanocomposite converted from diatomaceous earth as a potential thermoelectric nanomaterial[J].Journal of Solid State Chemistry,2008(7):1565-1570. |
| [7] | L. Wang;X.Y. Qin;W. Xiong;X.G. Zhu .Fabrication and mechanical properties of bulk nanocrystalline intermetallic Mg2Si[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1-2):216-222. |
| [8] | Wang HY;Wang W;Zha M;Zheng N;Gu ZH;Li D;Jiang QC .Influence of the amount of KBF4 on the morphology of Mg2Si in Mg-5Si alloys[J].Materials Chemistry and Physics,2008(2/3):353-358. |
| [9] | Tamura D;Nagai R;Sugimoto K;Udono H;Kikuma I;Tajima H;Ohsugi IJ .Melt growth and characterization of Mg2Si bulk crystals[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2007(22):8272-8276. |
| [10] | Blum W;Zhang P;Watzinger B et al.Comparative study of creep of the die-cast Mg-alloys AZ91,AS21,AS41,AM60 and AE42[J].Materials Science and Engineering A,2001,319-321:735-740. |
| [11] | E. Evangelista;S. Spigarelli;M. Cabibbo .Analysis of the effect of Si content on the creep response of an Mg-5Al-Mn alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(0):62-66. |
| [12] | Guo E;Ma B;Wang L .Modification of Mg2Si morphology in Mg-Si alloys with Bi[J].Journal of Materials Processing Technology,2008,206(1-3):161-166. |
| [13] | Shih-Wei Lee;Jien-Wei Yeh .Superplasticity of 5083 alloys with Zr and Mn additions produced by reciprocating extrusion[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(0):409-419. |
| [14] | X. F. Guo;D. Shechtman .Reciprocating extrusion of rapidly solidified Mg-6Zn-1Y-0.6Ce-0.6Zr alloy[J].Journal of Materials Processing Technology,2007(0):640-644. |
| [15] | Shih-Wei Lee;Yu-Liang Chen;Hsiao-Yun Wang;Chih-Fu Yang;Jien-Wei Yeh .On mechanical properties and superplasticity of Mg-15Al-1Zn alloys processed by reciprocating extrusion[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):76-84. |
| [16] | H. Somekawa;K. Hirai;H. Watanabe .Dislocation creep behavior in Mg-Al-Zn alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):53-61. |
| [17] | 陈培生,吕庆风,孙扬善,蒋建清,马爱斌.AZ31/SiCp复合材料的高应变速率超塑性[J].南京航空航天大学学报(英文版),2001(01):17-21. |
| [18] | Mann G;Griffiths J R;Caceres C H .Hall-Petch parameters in tension and compression in cast Mg-2Zn alloys[J].Journal of Alloys and Compounds,2004,378(1-2):188-191. |
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