采用Gleeble-1500热模拟实验机在温度为623～773K,应变速率为0.001～1s-1条件下对Mg-10Gd-4.8Y-2Zn-0.6Zr(wt%)合金进行热压缩实验,研究了该合金热变形行为及热加工特征,建立了该合金热变形时的本构方程和加工图.结果表明,该合金高温变形时的峰值应力随着应变速率的降低和变形温度的升高而显著减小;变形激活能为289.36kJ/mol;合金高温变形时存在两个失稳区,分别是变形温度为770～773K,应变速率为0.1s-1左右的区域,和变形温度小于750K,应变速率小于0.03s-1的区域;合金的最佳热加工温度为750～773K,应变速率为0.001～0.01s-1.
参考文献
| [1] | P. J. Apps;H. Karimzadeh;J. F. King;G. W. Lorimer .Phase compositions in magnesium-rare earth alloys containing yttrium, gadolinium or dysprosium[J].Scripta materialia,2003(5):475-481. |
| [2] | Drits M E;Sviderskaya Z A;Rokhlin L L et al.Effect of alloying on the properties of Mg-Gd alloys[J].Metallovedenie I Termicheskaya Obrabotka Metallov,1979,21(11):62-64. |
| [3] | Negishi Y;Nishimura T;Iwasawa S et al.Aging characteristics and tensile properties of Mg-Gd-Nd-Zr alloys[J].Light Metals,1994,44(10):555-561. |
| [4] | He S M;Zeng X Q;Peng L M et al.Microstructure and strengthening mechanism of high strength Mg-10Gd02Y-0.5Zr alloy[J].Journal of Alloys and Compounds,2006,427(16):316-323. |
| [5] | 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. |
| [6] | Shigeharu K;Yuta K;Yoshitada H et al.High temperature formation characteristics and forgeability of Mg-heavy rare earth element Zr alloys[J].Journa of Japan Institute of Light Metals,1998,48(04):168-173. |
| [7] | 彭卓凯,张新明,陈健美,肖阳,蒋浩,邓桢桢.Mn,Zr对Mg-Gd-Y合金组织与力学性能的影响[J].中国有色金属学报,2005(06):917-922. |
| [8] | 余琨,黎文献,王日初,马正青.变形镁合金的研究、开发及应用[J].中国有色金属学报,2003(02):277-288. |
| [9] | Liu X B;Chen R S;Han E H et al.Effects of aging treatment on microstructures and properties of Mg-Gd-Y-Zr alloys with and without Zn additions[J].Journal of Alloys and Compounds,2008,465(1-2):232-238. |
| [10] | 张治民,杨宝付,刘奎立.ZTC4合金筒形件等温挤压成形数值模拟研究[J].塑性工程学报,2004(03):31-34. |
| [11] | 张新明,陈健美,邓运来,肖阳,蒋浩.Mg-Gd-Y-Zr耐热镁合金的压缩变形行为[J].中国有色金属学报,2005(12):1925-1932. |
| [12] | 沈健.热压缩2091 Al-Li合金的流变应力行为[J].稀有金属,1998(01):47-50. |
| [13] | Sheppard T;Parson N C;Zaidi M A et al.Dynamic recrystallization in Al-Mg[J].Metal Science Journal,1983,17(10):481-487. |
| [14] | Prasad Y V R K;Sasidhara S.Hot Working Guide:A Compendium of Processing Maps[M].Materials Park.OH:ASM International,1997:23-29. |
| [15] | Bozzini B.;Cerri E. .Numerical reliability of hot working processing maps[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):344-347. |
| [16] | Y. V. R. K. Prasad;T. Seshacharyulu .Modelling of hot deformation for microstructural control[J].International Materials Reviews,1998(6):243-258. |
| [17] | Raj R .Development of a processing map for u8e in warm-forming and hot-forming processing[J].Metallurgical and Materials Transactions,1981,12(06):1089-1097. |
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