采用挤压铸造方法制备了硼酸镁晶须增强纯铝基复合材料，在450℃下对其进行了不同时间的退火处理，研究了不同退火时间对复合材料的室温力学性能、热膨胀行为及基体织构的影响．试验结果表明，退火处理能有效提高复合材料的抗拉强度，随着退火时间的增加材料的拉伸强度也逐渐增加，在5 h时达到最大值295 MPa，7 h时略有下降，为285 MPa．复合材料的热膨胀曲线表明，退火处理会使材料的热膨胀系数变大，随着退火时间的增加，材料的热膨胀系数先增加后减小，但始终高于未退火处理的材料．
Mg2 B2 O5 whisker-reinforced aluminum composite was fabricated by squeeze casting method, and the composite was annealed at 450 ℃ for different time. The effects of annealing time on the ultimate tensile strength at room temperature, thermal expansion behaviors, and the matrix texture were studied. The results show that the annealing can effectively improve the ultimate tensile strength of the composite. The ultimate tensile strength increases with the annealing time increasing, and attains its highest strength (295 MPa) at the annealing time of 5 h, but the strength decreases slightly to 285 MPa at the annealing time of 7 h. It is also found that the coefficient of thermal expansion increases with the annealing time increasing first and then decreases, but the coefficients of the composite after annealing are larger than that of untreated composite.
参考文献
| [1] | 张国定,赵昌正.金属基复合材料[M].上海:上海交通大学出版社,1996:11-175.ZHANG Guoding, ZHAO Changzheng.Metallic Matrix Composites [M].Shanghai:Shanghai Jiao Tong University Press, 1996.11-175.,1996. |
| [2] | 朱秀英.晶须增强铝基复合材料研究进展[J].宇航材料工艺,1994 (1):14-17.ZHU Xiuying.Research Situation of aluminum matrix composite [J].Aerospace Materials & Technology,1994 (1):14-17.,1994. |
| [3] | LIZJ,FEIWD,YUEHY,etal.Hotdeformation behaviors of Bi2 O3 coated Al18 B4 O33 whisker reinforced aluminum borate qhisker reinforced aluminum composite at elevated temperature [J].Materials Science and Engineering.2007, 447(1-2):275-280.,2007. |
| [4] | 李武.无机晶须[M].北京:化学工业出版社,2005.90-112.LI Wu.Inorganic Whisker [M].Beijing:Chemical Industry Press, 2005.90-112.,2005. |
| [5] | HEMY,KISERM,WUB,et al.Influence of thermal expansion mismatch on residual stresses and flow response of microballoon composites [J].Mechanics of Materials, 1996, 23:133-146.,1996. |
| [6] | FEIWD,HUM,YAOCK .Thermal expansion and thermal mismatch stress relaxation behaviors of SiC whisker reinforced aluminum composite[J].Materials Chemistry and Physics,2002,77 |
| [7] | HUJ,LUORS,FEIWD,et al.Effect of annealing treatment on the microstructure of matrix in SiC whisker reinforced aluminum composite [J].Journal of Materials Science Letters,1999, 18:1515-1527.,1999. |
| [8] | 毛卫民.金属材料的晶体学织构与各向异性[M].北京:科学出版社,2002:33-63.MAO Weimin.The crystallographic texture and anisotropy of metal materials [M].Beijing:Science Press, 2002:33-63.,2002. |
| [9] | CLYNETW,WITHERSPJ.Anintroductiontometal matrix composites [C]//Cambridge:Cambridge Uni-versity Press, 1993.400-428.,1993. |
| [10] | FEI W D, WANG L D.Thermal expansion behavior and thermal mismatch stress of aluminum matrix composite reinforced by β-eucryptite particle and aluminum borate whisker [J].Materials Chemistry and Physics, 2004, 85:450-457.,2004. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%