Interfacial bonding in spray-formed metal matrix composites

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-997-0242-z· OSTI ID:484858

Sanctis, M de; Valentini, R; Solina, A ^[1]

---

1. Univ. of Pisa (Italy)

The modulus, strength, and ductility of Al alloys reinforced with ceramic particulate (AMMCs) are influenced by many variables, such as the volume fraction, distribution, and dimension of particulate, the matrix flow stress, and the debond resistance of the interface. As far as the failure mechanism of composites is concerned, different sources of fracture can be operative, and usually they are the reinforcement fracture, the matrix reinforcement interfacial decohesion, and the ductile failure in the matrix by nucleation, growth, and coalescence of cavities around particulates. Lewandowski et al, stressed the importance of interface bonding in determining the failure mechanism for a SiCp-reinforced Al-Zn-Mg-Cu alloy produced by power metallurgy (PM). They observed changes in the fracture surface morphology between underaged and overaged tempers of the composite, the former exhibiting extensive particulate fracture and the latter a fracture near the SiC/matrix interfaces. It was suggested that the change could reflect an embrittlement of the interface through extensive precipitation of secondary phases during heat exposure of the material. In the present work, the author studied a spray-deposited (SD) SiCp-reinforced Al-Zn-Mg-(Cu) alloy and observed that the failure mechanism described previously was operative not only in peak-aged material, but also following strong overagings, thus suggesting a substantially different behavior in respect to similar materials processed by the PM route.

• Sponsoring Organization: USDOE
• OSTI ID: 484858
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 4 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BONDING
COMPOSITE MATERIALS
COPPER ALLOYS
EXPERIMENTAL DATA
INTERFACES
LIQUID METALS
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PARTICULATES
SILICON CARBIDES
SPRAY COATING
TENSILE PROPERTIES
YOUNG MODULUS
ZINC ALLOYS