Damping capacity of BaTiO3/Al composites fabricated by hot extrusion

被引：21

作者：

Fan, Gen-lian ^{[1
]}

Li, Zhi-qiang ^{[1
]}

Zhang, Di ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 10期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

high damping materials; metal matrix composites; barium titanate; mechanical properties; interface; PARTICULATE; BEHAVIOR; MOTION;

D O I：

10.1016/S1003-6326(11)61493-3

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

To develop new type of high damping metal matrix composites, large grain size barium titanate (BaTiO3) ceramic was sintered and added into Al powder to fabricate BaTiO3/Al composites through the powder metallurgy method and hot extrusion. The damping properties of BaTiO3 ceramic, Al matrix and BaTiO3/Al composites were examined by dynamic mechanical analysis in the temperature range from 273 K to 573 K. The results show that although BaTiO3 exhibits high damping (tan delta=0.12) below 400 K, the damping capacity of 10% BaTiO3/Al (mass fraction) composites below 400 K is not increased as compared to the Al matrix. On the other hand, the damping capacity above 450 K is greatly enhanced due to the motion of dislocations at the interfaces between ceramic particles and Al matrix. The failure of exerting the intrinsic damping of BaTiO3 particles in the composites is attributed to the poor interface bonding between the particles and the matrix. The tensile strength of the composite is 42% higher than that of the Al matrix, which indicates the possibility of obtaining high strength and high damping composites via interface improvement and the addition of high volume fraction of large grain BaTiO3 particles.

引用

页码：2512 / 2516

页数：5

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