Investigation of crack-tip plasticity in high volume fraction particulate metal matrix composites

High volume fraction Aluminum/alumina-fused silica hybrid metal matrix composites containing alumina with 0, 10, 30 and 50 wt% fused silica were produced by melt squeezing casting method. Microstructure of hybrid composite was investigated by optical microscope and scanning electron microscopy (SEM). The SEM images showed uniform distribution of fused silica particles in composite microstructure. Also compressive strength of the composites changed (310-110 MPa) with amount of fused silica.

Download Full-text

Experimental Research on Ultrasonic Vibration Milling Metal Matrix Composites SiCp/Al

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.291-294.1725 ◽

2011 ◽

Vol 291-294 ◽

pp. 1725-1728 ◽

Cited By ~ 2

Author(s):

Guo Fu Gao ◽

Yan Yan Zhao ◽

Dao Hui Xiang ◽

Bo Zhao

Keyword(s):

Metal Matrix Composites ◽

Ultrasonic Vibration ◽

Metal Matrix ◽

Volume Fraction ◽

High Volume ◽

Machining Process ◽

Matrix Composites ◽

Machining Performance ◽

Ultrasonic Milling ◽

Vibration Milling

Although particle reinforced metal matrix composites possess excellent physical properties, its machining performance is rather bad because of its specific structure. It is difficult to obtain good cutting effect by traditional machining method. So machining has become the bottleneck which strictly restricts its industry application. This paper mainly focuses on both wear characteristics of different tool materials and material removal mechanism in ultrasonic milling high volume fraction particle reinforced metal matrix composites SiCp/Al. An acoustic device for ultrasonic vibration milling was developed to introduce the ultrasonic vibration into the traditional machining process. Through the contrast experiment of traditional milling and ultrasonic vibration milling SiCp/Al, the mechanism of tool wear and characteristics of surface topography were analyzed. The experimental results showed that the surface integrity and tool life in the ultrasonic vibration milling SiCp/Al were improved. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Download Full-text

A Comparison Between Two Models That Predict the Elastic-Plastic Behavior of Particulate Metal Matrix Composites Under Multiaxial Fatigue Type Loading

Materials ◽

10.1115/imece2003-42001 ◽

2003 ◽

Cited By ~ 3

Author(s):

Gbadebo Moses Owolabi ◽

Meera N. K. Singh

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Volume Fraction ◽

Constitutive Relations ◽

Multiaxial Fatigue ◽

Cyclic Plasticity ◽

Plastic Behavior ◽

Matrix Composites ◽

Elastic Plastic ◽

Particulate Metal

This paper is an effort to first modify two cyclic plasticity models developed for homogeneous metals to address the heterogeneous nature of particulate metal matrix composites (PMMCs), and subsequently to evaluate the resulting relations both theoretically and experimentally. Specifically, using the original Mro´z model and the endochronic theory of plasticity as their bases, two sets of elastic-plastic constitutive relations are identified. These sets of relations account for the interaction in stress fields between adjacent particles in PMMCs. The behavior predicted by each model is compared with experimental results obtained from a series of uniaxial and biaxial (tension-torsion) tests performed on circular specimens made of the 6061/Al2O3/20p-T6 PMMCs with 20% volume fraction of particles. The materials are tested for a variety of applied monotonic and cyclic loading paths.

Download Full-text