采用高温拉伸、透射电镜、X射线衍射仪、差示扫描量热计和超塑性经典理论,对低压浸渗、小挤压和热轧制备的SiC晶须增强2024Al基复合材料超塑性的力学行为和变形机制进行了研究.研究表明:复合材料的晶粒细小,尺寸约为1 μm;在温度为788 K、初始应变速率为3.3×10-3s-1的拉伸条件下,超塑伸长率为370%;DSC曲线上有一小的初期熔化吸热峰,其温度相应于偏晶反应:Al+Al2Cu+Cu4Mg5Si4Alx→液相+Mg2Si,785 K;超塑性变形的主导机制为传统的晶界扩散机制和适量液相共同控制的晶界(界面)滑动.
参考文献
| [1] | Xu X J, Zhang D, Shi Z L, et al. High strain rate superplasticity in a SiCW/2024Al composite made by squeeze casting [J]. Acta Metallurgiaca Sinica,1998,11(4):275-280. |
| [2] | Xu X J, Zhao C Z, Zhang D, et al. High strain rate superplasticity of SiC whisker reinforced pure aluminum composite [J]. Transactions of Nonferrous Metals Society of China, 1999,9(3):500-504. |
| [3] | Nieh T G, Wadsworth J. The role of liquid phase on superplasticity in metals and ceramics [J]. Mat Sci Forum, 1997, 233-234:383-398. |
| [4] | Mishra R S, Bieler T R, Mukherjee A K. Mechanism of high strain rate superplasticity in aluminum alloy composites [J]. Acta Metall Mater, 1997, 45(2):561-568. |
| [5] | http://www.matweb.com/SpecificMaterial.asp?bassnum=MA2244. |
| [6] | Ball A, Hutchison M M. Superplasticity in the Zn-Al eutectoid [J]. Met Sci J, 1969, 3:1-7. |
| [7] | Mukherjee A K. The rate controlling mechanism in superplasticity [J]. Mat Sci Eng, 1971, 8:83-89. |
| [8] | Gifkins R C. Grain-boundary sliding and its accommodation during creep and superplasticity [J]. Metall Trans, 1976, 7A:1225-1232. |
| [9] | Langdon T G. A unified approach to grain boundary sliding in creep and superplasticity [J]. Acta Metall Mater, 1994, 42(7):2437-2443. |
| [10] | Langdon T G. Grain boundary sliding as a deformation process in creep and superplasticity [J]. Mat Sci Forum, 1994, 170-172:53-58. |
| [11] | http://www.mse.eng.ohio-state.edu/～daehn/shademan/sld007.htm. |
| [12] | http://www.xrefer.com/entry/639584. |
| [13] | Langdon T G. Cavitation in high strain rate superplasticity-implications for the flow process [J]. Mater Sci Forum, 1997, 233-234:47-62. |
| [14] | http://atmos.nmsu.edu/education-and-outreach/encyclopedia/gas-constant.htm. |
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