Processing, microstructure and properties of ultrasonically processed in situ MgO-Al2O3-MgAl2O4 dispersed magnesium alloy composites

被引：46
作者：
Bhingole, P. P. [2 ]
Chaudhari, G. P. [1 ]
Nath, S. K. [1 ]
机构：
[1] Indian Inst Technol, Dept Met & Mat Engn, Roorkee 247667, Uttar Pradesh, India
[2] Graph Era Univ, Dehra Dun, Uttar Pradesh, India
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2014年 / 66卷
关键词：
Metal-matrix composites (MMCs); Mechanical properties; Microstructures; Casting; MECHANICAL-PROPERTIES; MATRIX COMPOSITE; ALUMINUM-ALLOYS; BEHAVIOR; CARBON;
D O I：
10.1016/j.compositesa.2014.08.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
AZ91 alloy matrix composites are synthesized by in situ reactive formation of hard MgO and Al2O3 particles from the addition of magnesium nitrate to the molten alloy. The evolved oxygen from decomposition of magnesium nitrate reacts with molten magnesium to form magnesium oxide and with aluminium to form aluminium oxide. Additionally, these newly formed oxides react with each other to form MgAl2O4 spinel. Application of ultrasonic vibrations to the melt increased the uniformity of particle distribution, avoided agglomeration, and decreased porosity in the castings. Ultrasound induced physical phenomena such as cavitation and melt streaming promoted the in situ chemical reactions. Well dispersed, reactively formed hard oxides increased the hardness, ultimate strength, and strain-hardening exponent of the composites. Presence of well-dispersed hard oxide particles and stronger interface resulting from cavitation-enhanced wetting of reactively formed particles in the AZ91 alloy matrix improved the sliding wear resistance of the composites. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：209 / 217
页数：9
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