Abstract
Novel amorphous/crystalline composites were developed combining the ductile copper matrix with hard CuZr-based amorphous powder. The amorphous powders of two compositions, Cu39.2Zr36All4.8Ni10Ti10 and Cu39.2Zr35.2Al5.6Ni10Ti10, produced by ball milling were used for reinforcement of the composites. Different mixing techniques, magnetic mixing, ultrasonic mixing and high-energy ball milling, were applied in order to create a homogenous mixture of the powders. The composites were produced by hot pressing under a purified argon atmosphere. Their microstructure, homogeneity and mechanical properties were investigated. It was observed that before hot pressing, minimal porosity had been obtained for the composite blended for 15 min by the ball-mill with a ball-to-powder ratio of 80:1. Its copper content was 50 wt %, which is the minimum to produce a compact composite. Reinforcing the copper by amorphous powders, the maximal compressive strength was enhanced to 490 MPa and 470 MPa, respectively, for the abovementioned composites. The yield strength of the copper due to reinforcement increased drastically from 150 MPa to 400 MPa and 420 MPa.
Highlights
Particle-reinforced metal matrix composites (MMCp ) have been studied over the past decades.Combining the large ductility of the matrix with the high hardness of the reinforcement, a new composite with enhanced mechanical properties can be created
The particles coagulate, which prohibits the homogenous mixing of the copper and the amorphous powders
New amorphous/crystalline composites were developed by combining ductile
Summary
Particle-reinforced metal matrix composites (MMCp ) have been studied over the past decades. Combining the large ductility of the matrix with the high hardness (strength, stiffness) of the reinforcement, a new composite with enhanced mechanical properties can be created. Amorphous particles can be produced by mechanical milling or mechanical alloying [2,3]. Amorphous particulate reinforced lightweight metal (Al [4,5], Mg [6,7,8]) composites were investigated owing to their high specific strength and low density. The metallic nature of the reinforcing phase plays an important role in achieving good bonding between the matrix and the glassy reinforcement in contrast to the usual conventional ceramic reinforcing phases, where detrimental interfacial reactions often occur.
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