Cold work loss during heat treatment and extrusion of Nb-46.5 wt.% Ti composites as measured by microhardness

Author

Parrell, J.A. ; Lee, P.J. ; Larbalestier, D.C.

Author_Institution

Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

734

Lastpage

737

Abstract

The authors utilized the simple technique of hardness measurement as a probe of the retained cold work in variously treated Nb-Ti monofilament rod stock, and they compare these results on extruded multifilament rod stock. In this experiment the cold work loss which occurs during monofilament heat treatment and multifilamentary extrusion was directly measured by comparing the Vickers hardness of the same Nb-46.5wt.%Ti alloy stock which had been cold drawn at room temperature, heat treated and cold drawn, and warm extruded. Depending on the strain state of the filaments prior to extrusion, a strain loss between 1.4 and 5.4 was determined in the extruded billet filaments. This is a very significant loss range given that the total strain space of most multifilamentary stacks lies in the range of 11-12.<>

Keywords

composite superconductors; extrusion; hardness; heat treatment; niobium alloys; superconducting cables; superconducting magnets; titanium alloys; Nb-Ti; Vickers hardness; cold work loss; composites; extrusion; hardness measurement; heat treatment; loss range; microhardness; monofilament rod stock; multifilament rod stock; retained cold work; room temperature; strain loss; strain state; superconducting magnet cables; total strain space; Billets; Capacitive sensors; Critical current density; Fabrication; Flux pinning; Grain boundaries; Heat treatment; Loss measurement; Morphology; Multifilamentary superconductors;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233808

Filename

233808