球状颗粒强化复合材料Al-6061/Al<sub>2</sub>O<sub>3</sub>的强化作用

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球状颗粒强化复合材料Al-6061/Al₂O₃的强化作用

1.
School of Metallurgy, Xi'an University of Architecture &|Technology, Xi'an 710055, China;
2.
Fukuoka University of Education, Fukuoka 811-41, Japan;
3.
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812, Japan|
4.
Department of Materials Science and Engineering, University of Southern California, CA 90089-1453, USA

摘要: 研究了6061/Al₂O₃复合材料中球形Al₂O₃颗粒的强化作用。该强化颗粒的加入大大提高了材料在固溶处理后未时效状态的强度。对组织的观察和位错密度的测量表明,该强化作用与位错强化模型的计算结果一致。强化颗粒的加入还显著提高了材料在各种时效状态的加工硬化率。将Ashby提出的含异质颗粒复合材料的几何必须位错模型与位错强化模型结合,可以很好地解释加工硬化率的提高。
- 金属基复合材料 /
- 球状强化颗粒 /
- 位错强化 /
- 加工硬化
Abstract: The strengthening effect of Al₂O₃ microspheres was investigated in an Al-6061 based metal matrix composite. The strength of the material in the solid solution state was significantly increased by the addition of the reinforcement microspheres. This increase in strength corresponds well to the calculation of a dislocation strengthening model using dislocation densities measured from TEM observations. The strain hardening rate of the material in various aging states is also increased by this addition, which can be accounted for by the combination of the dislocation strengthening model and the model of geometrically necessary dislocations in plastically non-homogeneous material proposed by Ashby.
- metal matrix composite /
- reinforcement microspheres /
- dislocation strengthening /
- strain hardening