Microstructure and mechanical properties of rapidly solidified Al-20Si-xFe (x = 0, 3, 5, 7) alloys

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:186754

Chun, B S; Cho, S S; Hong, S J; Kim, T S; Won, C W ^[1]; Kim, W T ^[2]

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1. Chung Nam National Univ., Daejeon (Korea, Republic of)
2. Chongju Univ. (Korea, Republic of). Dept. of Physics

The microstructure and mechanical properties of Al-20Si-xFe (x = 0, 3, 5, 7wt%) alloys, manufactured by gas atomization followed by degassing and hot extrusion, were studied by a combination of optical microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffractometry, tensile testing and wear testing. As solidified Al-20Si-xFe powder microstructure consists of needle shaped {delta}-Al{sub 4}FeSi{sub 2} particles and primary Si embedded in Al-Fe-Si eutectic. With increasing Fe content, the size and volume fraction of the {delta}-Al{sub 4}FeSi{sub 2} increased but the size and volume fraction of primary Si decreased. The needle shaped {Delta}-Al{sub 4}FeSi{sub 2} transformed into an equilibrium {beta}-Al{sub 5}FeSi phase during degassing and hot extrusion. The microstructure of extruded bars shows a homogeneous distribution of two different sizes of {beta}-Al{sub 5}FeSi and Si particles embedded in an {alpha}-Al matrix. With increasing Fe content from Al-20Si to Al-20Si-7Fe, tensile strength increased from 215 to 404MPa at 300K and from 122MPa to 240MPa at 473K. Al-20Si-5Fe alloy shows the best wear resistance. Tensile strength varies significantly with initial powder size but wear resistance is independent of initial alloy powder size.

• OSTI ID: 186754
• Report Number(s): CONF-950201--; ISBN 0-87339-316-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ATOMIZATION
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
EXTRUSION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
OPTICAL MICROSCOPY
PARTICLE SIZE
POWDERS
SILICON ALLOYS
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
WEAR
X-RAY DIFFRACTION