Hardness and Wear Behaviour of Semi-Solid Cast A390 Alloy Reinforced with Al2O3 and TiO2 Nanoparticles

被引：26
作者：
El Mahallawi, I. [1 ]
Shash, Y. [2 ]
Rashad, R. M. [2 ]
Abdelaziz, M. H. [3 ]
Mayer, J. [4 ]
Schwedt, A. [4 ]
机构：
[1] Cairo Univ, Fac Engn, Dept Min Petr & Met Engn, Cairo, Egypt
[2] Cairo Univ, Fac Engn, Dept Mech Engn, Cairo, Egypt
[3] British Univ, Fac Engn, Dept Mech Engn, El Sherouk, Egypt
[4] Univ Aachen, Gemeinshaftslab, Aachen, Germany
来源：
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING | 2014年 / 39卷 / 06期
关键词：
Nanodispersion; Semi-solid processing; Hypereutectic Al-Si cast alloys; Hardness and wear; METAL-MATRIX COMPOSITES; MECHANICAL-PROPERTIES; MICROSTRUCTURE; ALUMINUM;
D O I：
10.1007/s13369-014-1179-3
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
In this work, a series of castings of hypereutectic aluminium-silicon samples (A390) were prepared by rheo-casting in a specially designed and built furnace unit allowing for the addition of the Al2O3/TiO2 nanoparticles to the Al-Si slurry, with mechanical stirring. The microstructure features and the hardness of the cast samples were investigated, as well as the resistance to wear in laboratory tests. The results obtained in this work show enhancement in the micro-hardness and hardness of the Al2O3/TiO2 nanodispersed hypereutectic A390 alloys, combined with improved wear resistance. The obtained results revealed that the introduction of Al2O3/TiO2 nanodispersions together with the stirring effect induces a refining role, as significant refining was observed in the microstructure of the alloy. The results have also shown that modified intermetallic precipitates have appeared after adding the Al2O3/TiO2 nanoparticles. Evidence for the formation of a combined (TiAlMgSi) oxide has been also presented in this work and its contribution in enhancement of wear resistance cannot be ruled out.
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页码：5171 / 5184
页数：14
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