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Indexed by:期刊论文

Date of Publication:2016-10-01

Journal:TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS

Included Journals:SCIE、Scopus

Volume:69

Issue:8

Page Number:1557-1562

ISSN No.:0972-2815

Key Words:Vanadium alloy; Cluster-plus-glue-atom model; Composition design; Properties

Abstract:A cluster formula of [M - V-14]M-1 was formed for vanadium alloys based on a cluster-plus-glue-atom model for BCC solid solutions, where the clusters [M - V-14] were centered by one solute M and surrounded by fourteen solvent atoms V, and M could also be served as a glue atom to link clusters. The [M - V-14]M-1 formula with M = V1/3Cr1/3Ti1/3, an equal-molar combination of V, Cr and Ti, corresponded to the typical V-4Cr-4Ti alloy (wt.%). Based on this formula, a series of new alloys with Ta and Zr substitution for V and Ti respectively in M, were designed and molded into I center dot 3 mm rods by copper-mold suction-cast method. These alloys were solid-solutioned at 1273 K for 2 h followed by water-quenching. For Zr-added alloys, the second phase V2Zr was prone to be precipitated, that made alloys much brittle and worse corrosion-resistant in Cl- solution. While Ta-alloyed alloys exhibited a single BCC structure, the Vickers hardness HV of alloys were enhanced obviously. Among them, the Ta-added alloy with M = Ta1/3Cr1/3Ti1/3 (V79.21Ta13.4Cr3.85Ti3.54 wt.%) displayed both higher microhardness and better corrosion-resistance in Cl- solution.