Fracture toughness of discontinuously reinforced Al-4Cu-1. 5Mg/TiB[sub 2] composites

Journal Article · Mon Oct 31 23:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

OSTI ID:7181112

Tan, N C.B.; Briber, R M ^[1]; Aikin, Jr, R M ^[2]

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1. Univ. of Maryland, College Park, MD (United States). Dept. of Materials Engineering
2. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering

The effect of particle size, particle volume fraction, and matrix microstructure on the fracture initiation toughness of a discontinuously reinforced aluminum composite was examined. The composites were Al-4 wt pct Cu-1.5 wt pct Mg reinforced with 0 to 15 vol pct of TiB[sub 2] having an average particle diameter of 1.3 or 0.3 [mu]m produced in situ by the XD process. The room-temperature plane-strain toughness measured using compact tension specimens ranged from 19 to 25 MPa[radical]m. Toughness was adversely affected by increase in TiB[sub 2] volume fraction. The fracture toughness of all composites was affected by changes in the matrix microstructure produced by aging. The response of the composites to artificial aging deviates from that of the matrix. Fractography revealed that these composites failed in a ductile manner, with voids initiating at the reinforcing TiB[sub 2] particles. The experimentally measured plane-strain toughness properties of Al-4Cu-1.5Mg composites with well-dispersed, 1.3-[mu]m TiB[sub 2] reinforcements agree with the Rice and Johnson model.

• OSTI ID: 7181112
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:11; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
BORIDES
BORON COMPOUNDS
COMPOSITE MATERIALS
COPPER ALLOYS
DATA
EXPERIMENTAL DATA
FRACTURE PROPERTIES
INFORMATION
MAGNESIUM ALLOYS
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS