在Gleeb-1500D热模拟机上对原位合成TiB2(质量分数,8%)/6351复合材料进行热压缩实验,基于动态材料模型的Murty准则建立了复合材料的加工图.结果表明,加工图上有一个失稳区大致出现在应变速率高于0.316 s-1的区域,试样在失稳区压缩后增强体颗粒和基体的界面处开裂甚至增强体颗粒本身发生破碎;TiB2/6351复合材料高温变形时的主要软化机制为动态回复和动态再结晶.结合加工图和挤压工艺确定挤压温度为520℃,挤压速度为5.8 mm·s-1(应变速率为0.1 s-1);挤压棒材表面质量良好无裂纹等缺陷,棒材中增强体颗粒和基体界面结合良好,基体合金中存在完整的等轴晶.这表明,采用Murty准则优化的热挤压工艺参数较合理.
参考文献
| [1] | Lloyd D J .Particle reinforced aluminum magnesium composites[J].International Materials Reviews,1994,39(01):1. |
| [2] | Ganesan G;Raghukan K;Karthikeyan .Development of processing map for 6061 Al/15% SiCp through neural networks[J].Journal of Materials Processing Technology,2005,166:423. |
| [3] | Ramanathan S;Kartikeyan R;Ganasen G .Development of processing maps for 2124Al/SiCp composites[J].Materials Science and Engineering A,2006,441:321. |
| [4] | Cavaliere P;Cerri E;Leo P .Hot deformation and processing maps of a particulate reinforced 2618/Al2O3/20p metal matrix composite[J].Composites Science and Technology,2004,64:1287. |
| [5] | Cavaliere P;Cerri E;Evangelista E .Isothermal forging of AA2618+20% Al2O3 by means of hot torsion and hot compression tests[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(0):857-861. |
| [6] | Vedani M;Errico F D;Gariboldi E .Mechanical and fracture behaviour of aluminium-based discontinuously reinforced composites at hot working temperatures[J].Composites Science and Technology,2006,66:343. |
| [7] | Narayana Murty S V S;Nageswara Rao B;Kashyap B P .On the hot working characteristics of 6061 Al-SiC and 6061-Al2O3 particulate reinforced metal matrix composites[J].Composites Science and Technology,2003,63:119. |
| [8] | 鲁世强,李鑫,王克鲁,董显娟,李臻熙,曹春晓.基于动态材料模型的材料热加工工艺优化方法[J].中国有色金属学报,2007(06):890-896. |
| [9] | Y. V. R. K. Prasad;T. Seshacharyulu .Modelling of hot deformation for microstructural control[J].International Materials Reviews,1998(6):243-258. |
| [10] | Murty Narayana S V S;Rao Nngeswara B .On the development of instability criteria during hot working with reference to IN 718[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1998,254:76. |
| [11] | 白亮,陈东,马乃恒,王浩伟.原位生成TiB2/6351复合材料的组织和性能[J].热加工工艺,2007(12):30-33. |
| [12] | 黄光胜,汪凌云,陈华,黄光杰,张所全.2618铝合金的热变形和加工图[J].中国有色金属学报,2005(05):763-767. |
| [13] | 温景林.金属挤压与拉拔工艺学[M].沈阳:东北大学出版社,1996 |
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