PHASE DIAGRAM OF THE NIOBIUM-TIN SYSTEM

The phase diagram of the high tin portion of the niobium-tin system was constructed. The temperature range of stability of the various intermetallic compounds was determined. Ten alloys were arc melted, cast, and annealed at 750 degrees centigrade for 700 hr. On the basis of x-ray, thermal and micro...

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Bibliographic Details
Main Authors: Svechnikov,V. N, Pan,V. M, Beletskii,Yu. I
Format: Report
Language:English
Subjects:
EUTECTICS
INTERMETALLIC COMPOUNDS
NIOBIUM ALLOYS
PHASE DIAGRAMS
PHASE STUDIES
Properties of Metals and Alloys
THERMAL STABILITY
TIN ALLOYS
TRANSLATIONS
USSR
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Summary:The phase diagram of the high tin portion of the niobium-tin system was constructed. The temperature range of stability of the various intermetallic compounds was determined. Ten alloys were arc melted, cast, and annealed at 750 degrees centigrade for 700 hr. On the basis of x-ray, thermal and microstructural analysis, a phase diagram was constructed. Differential thermal curves are given, and the various temperature peaks are analyzed. Besides Nb3Sn, two other intermetallic compounds, Nb6Sn5 and NbSn2 exist in the niobium-tin system. However, they only form upon protracted annealing. For case niobium-tin alloys, in which the compounds Nb6 and NbSn2 are absent but in which the above monotectic occurs, a metastable equilibrium diagram can be constructed. In the metastable diagram, the equilibrium monotectic temperature and composition may differ from that obtained for a stable diagram. Apparently, the niobium-tin diagram obtained by Agafonov, et al is a metastable one. (Author) Edited machine trans. of Soveshchanie po Metallovedeniyu, Fiziko-Khimii i Metallofizike Sverkhprovodnikov (2dn/3rd), 1966. Trudy (Conference on Physical Metallurgy, Physico-Chemistry and the Physics of Metals of Superconduction (2nd/3rd), 1966, Transactions), m.p. 1967 p152-157.