| SiC晶须增强铝基复合材料超塑性 |
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| 引用本文： | 许晓静,戈晓岚.SiC晶须增强铝基复合材料超塑性[J].复合材料学报,2003,20(3):127-131. |
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| 作者姓名： | 许晓静 戈晓岚 |
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| 作者单位： | 江苏大学,机械工程系,镇江,212013 |
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| 基金项目： | 江苏省高校自然科学基金(02KJD460004) |
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| 摘 要： | 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+Cu4Mg5Si4Al<em>x→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。
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| 关 键 词： | 铝基复合材料 超塑性 液相 材料制备 |
| 文章编号： | 1000-3851(2003)03-0127-05 |
| 收稿时间： | 2001-12-17 |
| 修稿时间： | 2001年12月17 |
SUPERPLASTICITY OF SiC WHISKER ALUMINUM MATRIX COMPOSITE |
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| XU Xiaojing,GE Xiaolan.SUPERPLASTICITY OF SiC WHISKER ALUMINUM MATRIX COMPOSITE[J].Acta Materiae Compositae Sinica,2003,20(3):127-131. |
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| Authors: | XU Xiaojing GE Xiaolan |
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| Affiliation: | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013,China |
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| Abstract: | The superplastic mechanical behavior and deformation mechanism of the beta-SiC whisker reinforced 2024 aluminum composite, fabricated by low-pressure infiltration and hot-rolling after extrusion with a low extrusion ratio of 10∶1, were investigated by using elevated tensile tests, transmission electron microscopy, X-ray diffractometer, differential scanning calorimeter and the conventional theory of superplastic deformation mechanism for fine grain metals. The results show that the composite has a fine grain size of about 1 μm, and exhibits a maximum tensile elongation of 370 % in the initial strain rate of 3.3×10-3s-1 at 788 K. A small incipient melting peak on DSC curve of the composite appears and corresponds to the peritectic reaction of Al+CuAl2+Cu4Mg5Si4Al x→Liquid+Mg2Si at 785 K. The superplastic deformation mechanism of the composite is grain boundary (interface) sliding controlled by grain boundary diffusion of the aluminum atom and an appropriate amount of liquid phase. |
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| Keywords: | aluminum matrix composite superplasticity liquid phase material fabrication |
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