在变形温度为623-773 K、应变速率为0.01～1.0 s-1、最大变形量为60%条件下,采用Gleeble-1500D热/力模拟机对Mg-6.5Y-2.5Nd-0.6Zr合金热压缩变形流变应力行为进行实验研究.结果表明:在应变速率为1.0 s-1等温压缩时,由变形热引起的温升最大达到25 K,修正后流变应力最大比测量值增加31.2 MPa;而应变速率为0.1 s-1压缩时,流变应力的修正值较测量值先减小后增大,其差值在7.8 MPa以内.根据修正的真应力-真应变曲线,结合包含双曲正弦形式的Arrhenius方程并引入Zener-Hollomon参数建立了流变应力本构方程,运用该方程计算的峰值应力与修正的实验数据吻合很好,其相对误差不超过5%.
参考文献
| [1] | Mordike B L;Ebert T .Magnesium properties-application-potential[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2001,302:37-45. |
| [2] | Wang J G;Hsiung L M;Nieh T G et al.Creep of a heat treated Mg-4Y-3RE alloy[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2001,315:81-88. |
| [3] | Mohri T.;Saito N.;Nakamura M.;Mabuchi M. .Microstructure and mechanical properties of a Mg-4Y-3RE alloy processed by thermo-mechanical treatment[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(2):287-294. |
| [4] | Xibo Liu;Rongshi Chen;Enhou Han .High temperature deformations of Mg–Y–Nd alloys fabricated by different routes[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008(1/2):326-332. |
| [5] | 唐伟能,陈荣石,韩恩厚.Mg-Y-Nd-Zr合金的高温变形行为与热加工性能[J].金属学报,2006(10):1096-1100. |
| [6] | Tsutomu Murai;Shin-ichi Matsuoka;Susumu Miyamoto .Effects of extrusion conditions on microstructure and mechanical properties of AZ31B magnesium alloy extrusions[J].Journal of Materials Processing Technology,2003(2):207-212. |
| [7] | 李鹏喜,张波萍,陈晶益,屠怡范,蔡庆武.变形工艺对AZ31B镁合金薄板组织及力学性能的影响[J].材料热处理学报,2006(03):60-63. |
| [8] | Yang Z;Guo YC;Li JP;He F;Xia F;Liang MX .Plastic deformation and dynamic recrystallization behaviors of Mg-5Gd-4Y-0.5Zn-0.5Zr alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):487-491. |
| [9] | ZHAO Xin,ZHANG Kui,LI Xinggang,LI Yongjun,HE Qingbiao,SUN Jianfeng.Deformation behavior and dynamic recrystallization of Mg-Y-Nd-Gd-Zr alloy[J].稀土学报（英文版）,2008(06):846-850. |
| [10] | GAO Jiacheng,WANG Qiang,WANG Yong,LI Wei,NIU Wenjuan.Microstructure and kinetics of hot deformation WE43 magnesium alloy[J].稀有金属（英文版）,2008(04):405-409. |
| [11] | 王宏伟,易丹青,王斌,蔡金伶,钱锋,陈缇萦.Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd镁合金的高温塑性变形行为的热压缩模拟[J].中国有色金属学报,2010(03):378-384. |
| [12] | 熊创贤,张新明,陈健美,邓运来,邓桢桢.Mg-Gd-Y-Mn耐热镁合金的压缩变形行为研究[J].材料热处理学报,2007(03):47-53. |
| [13] | Ion S E;Humphreys F J;White S H .Dynamic recrystallisation and the development of mierostructure during the high temperature deformation of magnesium[J].Acta Metallurgica,1982,30:1909-1919. |
| [14] | Poirier J P;关德林.晶体的高温塑性变形[M].大连:大连理工大学出版社,1989 |
| [15] | Shi H;McLaren AJ;Sellars CM;Shahani R;Bolingbroke R .Constitutive equations for high temperature flow stress of aluminium alloys[J].Materials Science and Technology: MST: A publication of the Institute of Metals,1997(3):210-216. |
| [16] | Jonas J J;Sellars C M;Tegart W J et al.Strength and structure under hot working condition[J].International Metallurgical Reviews,1969,14(130):1-4. |
| [17] | Zener C;Hollomon J H .Effect of strain rate upon the plastic flow of steel[J].Journal of Applied Geophysics,1944,15(01):22-32. |
| [18] | L. Li;J. Zhou;J. Duszczyk .Determination of a constitutive relationship for AZ31B magnesium alloy and validation through comparison between simulated and real extrusion[J].Journal of Materials Processing Technology,2006(3):372-380. |
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