The effects of solution and ageing treatment (T6) on microstructure and tensile properties of as - extruded Mg- 10Gd-3Y-0.6Zr (mass fraction. % ) alloy were investigated. The results show that after T6 treatment, the diameter of grain increases to 20 μm. As the second phases dissolve into the matrix, the smaller and denser β phases precipitate inside the grains. After T6 -treatment, both yield strength (TYS) and ultimate tensile strength (UTS) are increased. Comparing with that in only ageing condition (T5), the UTS and TYS increased from 365 MPa, 285 MPa to 400 MPa, 310 MPa, respectively, but the elongation decreased from 7.0% to 3.5%. It has been found that the effects of precipitates on the strength are stronger than that of the growth of grain size.
参考文献
| [1] | Mordike B L;Ebert T .Magnesium properties -applications -potential[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2001,302(01):37-45. |
| [2] | Li Wen -xian;Tian Rong-zhang.Magnesium and magnesium alloy[M].长沙:中南工业大学出版社,2005:358-363. |
| [3] | Nie JF;Gao X;Zhu SM .Enhanced age hardening response and creep resistance of Mg-Gd alloys containing Zn[J].Scripta materialia,2005(9):1049-1053. |
| [4] | Peng Q M;Wu Y M;Fang D Q et al.Microstructure and properties of Mg-7Gd alloy containing Y[J].Journal of Alloys and Compounds,2007,430(1-2):252-256. |
| [5] | Wang YX;Guan SK;Zeng XQ;Dine WJ .Effects of RE on the microstructure and mechanical properties of Mg-8Zn-4Al magnesium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1-2):109-118. |
| [6] | Ifeanyi Anthony Anyanwu;Shigeharu Kamado;Yo Kojima .Aging Characteristics and High Temperature Tensile Properties of Mg-Gd-Y-Zr Alloys[J].Materials transactions,2001(7):1206-1211. |
| [7] | Mordike BL. .Creep-resistant magnesium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1-2 Special Issue SI):103-112. |
| [8] | GAO Yan,WANG Qudong,GU Jinhai,ZHAO Yang,TONG Yan,Junya Kaneda.Effects of heat treatments on microstructure and mechanical properties of Mg-15Gd-5Y-0.5Zr alloy[J].稀土学报（英文版）,2008(02):298-302. |
| [9] | He S M;Zeng X Q;Peng L M et al.Precipitation in a Mg -10Gd-3Y -0.4Zr (wt.%) alloy during isothermal ageing at 250 ℃[J].Journal of Alloys and Compounds,2006,421(1-2):309-313. |
| [10] | Jun Wang;Jian Meng;Deping Zhang;Dingxiang Tang .Effect of Y for enhanced age hardening response and mechanical properties of Mg-Gd-Y-Zr alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):78-84. |
| [11] | T. Honma;T. Ohkubo;K. Hono;S. Kamado .Chemistry of nanoscale precipitates in Mg-2.1Gd-0.6Y-0.2Zr (at.%) alloy investigated by the atom probe technique[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):301-306. |
| [12] | S.M. He;X.Q. Zeng;L.M. Peng .Microstructure and strengthening mechanism of high strength Mg-10Gd-2Y-0.5Zr alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2007(1/2):316-323. |
| [13] | Rokhlin LL.;Nikitina NI. .Recovery after ageing of Mg-Y and Mg-Gd alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(2):166-170. |
| [14] | P.J. Apps;H. Karimzadeh;J.F. King .Precipitation reactions in Magnesium-rare earth alloys containing Yttrium, Gadolinium or Dysprosium[J].Scripta materialia,2003(8):1023-1028. |
| [15] | J.F. Nie .Effects of precipitate shape and orientation on dispersion strengthening in magnesium alloys[J].Scripta materialia,2003(8):1009-1015. |
| [16] | C. Antion;P. Donnadieu;F. Perrard;A. Deschamps;C. Tassin;A. Pisch .Hardening precipitation in a Mg-4Y-3RE alloy[J].Acta materialia,2003(18):5335-5348. |
| [17] | Bamberger M. .Structural refinement of cast magnesium alloys [Review][J].Materials Science and Technology: MST: A publication of the Institute of Metals,2001(1):15-24. |
| [18] | Avedesian M M;Baker H.ASM specialty handbook-Mag-nesium and Magnesium Alloys[M].Ohio:ASM International,Materials Park,1999 |
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