Valence electron structure analysis of the cubic silicide intermetallics in rapidly solidified Al-Fe-V-Si alloy

Journal Article · Wed May 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00002-4· OSTI ID:247968

Wang, J Q; Qian, C F; Zhang, B J; Tseng, M K; Xiong, S W ^[1]

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1. Northeastern Univ., Shenyang (China)

The application of rapid solidification for the development of elevated temperature aluminum alloys has resulted in the emergence of several alloys based on the Al-Fe alloy system. Of particular interest are Al-Fe-V-Si alloys which have excellent room temperature and high temperature mechanical properties. In a pioneering study, Skinner et al. showed the stabilization of the cubic phase in ternary Al-Fe-Si alloy by the addition of a quaternary element, vanadium. The evolution of the microstructure in these alloys both during rapid solidification and subsequent processing is of crucial importance. Kim has demonstrated that the composition of the silicide phase in rapidly solidified Al-Fe-V-Si alloy is very close to Al{sub 12}(Fe,V){sub 3}Si with the body centered cubic (bcc) structure. The structure is closely related to that of quasicrystals.In view of the structural features and the relationship between the {alpha}{sub 12} and {alpha}{sub 13} phases, the researching emphasis should firstly be put on the {alpha}{sub 12} phase. In this paper the authors analyzed the {alpha} {minus}(AlFeSi)({alpha}{sub 12}-type) phase from the angle of atomic valence electron structure other than the traditional methods of obtaining the diffraction spots of the phase. Several pieces of information were obtained about the hybrid levels and bond natures of every kind of atom in the {alpha} {minus}(AlFeSi) phase. Finally the authors explained the phenomenon which V atom can substitute for Fe atom in the {alpha}{sub 12} phase and improve the thermal stability of the phase in Al-Fe-V-Si alloy.

• OSTI ID: 247968
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BCC LATTICES
CHEMICAL COMPOSITION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
LATTICE PARAMETERS
MICROSTRUCTURE
ORIENTATION
PHASE STUDIES
SILICIDES
SILICON ALLOYS
SOLIDIFICATION
VALENCE
VANADIUM ALLOYS