为改善超高强度SiCp/Al复合材料的塑性,以Bc路径对喷射沉积SiCp/7090Al（SiC颗粒体积分数15%,名义尺寸10μm）复合材料进行等径角挤压变形,研究了复合材料显微组织和力学性能的演变规律.结果表明：经过4个道次变形后,获得等轴晶粒,尺寸大约为400 nm;SiC颗粒在剪切应力作用下被破碎,尺寸约2μm;破碎的SiC颗粒间的空隙逐渐被基体填充、粘合,并在一定范围内随基体流动,提高了其分布均匀性;峰值时效处理后,复合材料的抗拉强度和屈服强度分别为770.0和575.0 MPa,弹性模量为106.6 GPa,伸长率为7.4%.
To improve the elongation of ultra-high strength SiCp/Al composite,equal channel angular pressing（ECAP） of Bc route was performed on an ultra-high strength SiCp/7090Al（the volume of SiC particles is about 15%,and the size is about 10 μm） composite,and the microstructures and mechanical properties were discussed.The results show that equiaxed grains with the average grain size of about 400 nm were obtained after four passes,and hard SiC particles were broken to 2 μm by the shear stress.Many cavities between the broken SiC fragments were filled with the matrix and they flew with the matrix in a certain range,which made the distribution of SiC in the matrix alloy homogeneous.The tensile strength,the yield strength,the modulus and the elongation of the composite after peak ageing treatment were 770.0 MPa,575.0 MPa,106.6 GPa and 7.4% respectively.
参考文献
| [1] | Segal VM. .MATERIALS PROCESSING BY SIMPLE SHEAR[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(2):157-164. |
| [2] | 罗蓬,夏巨谌,胡侨丹,王新云.基于等径角挤压（ECAP）的超细晶铸造镁合金制备研究[J].稀有金属材料与工程,2005(09):1493-1496. |
| [3] | 李萧,杨平,李继忠,丁桦.等通道挤压AZ80镁合金的析出行为和性能[J].材料研究学报,2010(01):1-9. |
| [4] | Mazurina, I;Sakai, I;Miura, H;Sitdikov, O;Kaibyshev, R .Effect of deformation temperature on microstructure evolution in aluminum alloy 2219 during hot ECAP[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008(1/2):662-671. |
| [5] | Ruslan Z. Valiev;Terence G. Langdon .Principles of equal-channel angular pressing as a processing tool for grain refinement[J].Progress in materials science,2006(7):881-981. |
| [6] | S. Ashouri;M. Nili-Ahmadabadi;M. Moradi .Semi-solid microstructure evolution during reheating of aluminum A356 alloy deformed severely by ECAP[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):67-72. |
| [7] | Cheng Xu;Steven Schroeder;Patrick B. Berbon .Principles of ECAP-Conform as a continuous process for achieving grain refinement: Application to an aluminum alloy[J].Acta materialia,2010(4):1379-1386. |
| [8] | 杨西荣,赵西成,付文杰.变形方式对工业纯钛室温ECAP组织及性能影响[J].稀有金属材料与工程,2009(11):1910-1915. |
| [9] | 张凌义,杨钢,黄崇湘,陈为亮,王立民.ECAP制备高强高韧马氏体耐热钢[J].金属学报,2008(04):409-413. |
| [10] | B. Mani;M.H. Paydar .Application of forward extrusion-equal channel angular pressing (FE-ECAP) in fabrication of aluminum metal matrix composites[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2010(1/2):116-121. |
| [11] | M. Saravanan;R.M. Pillai;K.R. Ravi;B.C. Pai;M. Brahmakumar .Development of ultrafine grain aluminium-graphite metal matrix composite by equal channel angular pressing[J].Composites science and technology,2007(6):1275-1279. |
| [12] | 孙有平,严红革,陈振华,陈刚.Bc路径等径角挤压7090/SICp的显微组织及性能[J].中国有色金属学报,2008(11):1964-1970. |
| [13] | Valiev RZ.;Alexandrov IV.;Islamgaliev RK. .Bulk nanostructured materials from severe plastic deformation [Review][J].Progress in materials science,2000(2):103-189. |
| [14] | 赵润娴,张建,毕大森,崔宏祥,李国刚.等通道转角挤压硅铝合金针状共晶硅损伤断裂实验[J].有色金属,2002(03):12-14. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%