采用熔铸一中间热处理-变形工艺制备了形变Cu-11Cr-0．07Ag原位复合材料，利用扫描电镜、数字微欧计及液晶电子拉力试验机研究了材料的微观组织、力学性能和导电性能。结果表明：随着冷加工变形量的增加，铸态无序分布的Cr枝晶状组织逐渐转为沿线拉方向排列，形成定向排列的Cr纤维，抗拉强度大幅提高，电导率略有下降。经适当冷加工变形和中间热处理后的形变Cu-11Cr-0．0TAg原位复合材料具有较好的强度和电导率匹配。冷加工变形量为8时，其抗拉强度和电导率分别达到851MPa和73．9％IAcS。
Deformation-processed Cu - 11Cr - 0.07Ag in situ composite was prepared by the cast and the thermo mechanical treatment process. The microstructure, mechanical and electrical properties were investigated by scanning electronic microscope, tensile- testing machine and microhmmeter. The results indicate that, with increasing cold deformation strain, the initially randomly distributed Cr dendrites in the as-cast Cu - 11Cr -0.07Ag alloy transform into Cr fibres of the deformation-processed in situ composite aligned parallel to the drawing axis, and the tensile strength increases, while the conductivity decreases. The good combination of strength and conductivity of the deformation-processed Cu- 11Cr- 0.0TAg in situ composite is achieved by using the proper cold deformation and heat treatment. The composite achieves a tensile strength of 851 MPa and a conductivity of 73.9 IACS when the cold deformation strain is 8.
参考文献
| [1] | LiuKM, Lu D P, Zhou H T, et al. Effect of Ag micro- alloying on the microstructure and properties of Cu - 14Fe in situ composite [J]. Materials Science and Engineering A, 2010, 527: 4953-4958. |
| [2] | 姚再起,葛继平,刘书华.形变Cu-11.5%Fe原位复合材料的强度和导电性[J].复合材料学报,2005,22(3):121-125. |
| [3] | Qu L, Wang E G, Zuo X W, et al. Experiment and simulation on the thermal instability of a heavily deformed Cu - Fe composite [J]. Materials Science and Engineering A, 2011, 528: 2532-2537. |
| [4] | Lu D P, Wang J, Zeng W J, et al. Study on high-strength and high-conductivity Cu -Fe -P alloys [J]. Materials Science and Engineering A, 2006, 421: 254-259. |
| [5] | BevkJ, Harbison J P, Bell J D. Anomalous increase in strength of in situ formed Cu - Nb multifilamentary composites [J]. Journal of Applied Physics, 1978, 49: 6031-6038. |
| [6] | Leprince-Wang Y, Han K, Huang Y K, et al. Microstructure in Cu - Nb microcomposites[J]. Materials Science and Engineering A, 2003, 351(1/2): 214-223. |
| [7] | Venugopal T, Prasad Rao K, Murty B S. Mechanical and electrical properties of Cu - Ta nanoeomposites prepared By high-enery Ball milling [J].Acta Materialia, 2007, 55(13):4439-4445. |
| [8] | XieZX, Gao H Y, LuQ, et al. Effeet of Ag addition on the as-cast microstructure of Cu- 8 % Fe in situ composites[J]. Journal of Alloys and Compounds, 2010, 508: 320-323. |
| [9] | Zhang L, Meng L, Liu J B. Effects of Cr addition on the microstructural, mechanical and electrical characteristics of Cu-6wt. % Ag microcomposite[J]. Scripta Materialia, 2005, 52: 587-592 |
| [10] | Sun S Q, Mao L, Guo Z M, et al. Structures and properties of deformation-processed Cu - 16Fe - 2Cr in-situ composites [J]. Transactions of Nonferrous Metals Society of China, 2003, 13(2): 307-310. |
| [11] | He W X, Yu Y, Wang E D, et ah Microstructures and properties of cold drawn and annealed submicron crystalline Cu-5%Cr alloy [J]. Transactions of Nonferrous Metals Society of China, 2009, 19(1): 93-98. |
| [12] | Liu K M, LuDP, Zhou H T, et al. Influence of Ag micro- alloying on the microstructure and properties of Cu - 7Cr in situ composite [J]. Journal of Alloys and Compounds, 2010, 500: L22-L25. |
| [13] | Gao H Y, Wang J, Shu D, et al. Microstructure and strength of Cu - Fe- Ag in situ composites [J]. Materials Science and Engineering A, 2007, 452/453: 367-373. |
| [14] | Gao H Y, Wang J, Shu D, et al. Effect of Ag on the microstructure and properties of Cu - Fe in situ composites [J]. Scripta Materialia, 2005, 53: 1105-1109. |
| [15] | 高海燕,王俊,疏达,等.Cu-Fe-Ag原位复合材料的组织和性能[J].复合材料学报,2006,23(6):120-126. |
| [16] | Hong S I, Hill M A. Microstructure and conductivity of Cu - Nb microcomposites fabricated by the bundling and drawing process[J]. Scripta Materialia, 2001, 44: 2509-2515. |
| [17] | 李海山,姚再起,刘书华,等.形变Cu-10%Cr-3%Ag原位复合材料研究[J].大连铁道学院学报,2005,26(4):66-70. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%