Investigation of the intermetallic [beta]'-phase in the Co--Al--Si system

An experimental investigation of the structure and physical properties of the intermetallic [beta]' (B2) phase in the Co--Al--Si system has been performed. It has been shown that alloying with silicon reduces the degree of long-range order and the lattice parameter of the B2 phase. It has been...

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Veröffentlicht in:Physics of metals and metallography 2017-03, Vol.118 (3), p.249
Hauptverfasser: Kazantseva, N.V, Ezhov, I.V, Davydov, D.I, Vinogradova, N.I, Terentev, P.B
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Sprache:eng
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Zusammenfassung:An experimental investigation of the structure and physical properties of the intermetallic [beta]' (B2) phase in the Co--Al--Si system has been performed. It has been shown that alloying with silicon reduces the degree of long-range order and the lattice parameter of the B2 phase. It has been revealed that small additives of silicon (up to 3 at %) favor the formation of pores and cracks and lead to a strong embrittlement of the alloy. In the structure of the Co-39.5 at % Al--3 at % Si alloy after high-temperature homogenization at 1260[degrees]C for 30 h and slow cooling, prismatic dislocation loops of a specific cubic shape formed by edge dislocations with a Burgers vector a (100) have been revealed. It has been shown experimentally that the changes in the magnetic properties of the weakly magnetic CoAl-based alloys can serve as an indicator of the degree of the defect nature of the crystal lattice of this intermetallic compound. Keywords: intermetallic compound CoAl, alloying with Si, prismatic dislocations, magnetic properties
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X17030061