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Extrusion and Mechanical Properties of Some Molybdenum- and Tungsten-Base Alloys

Report Number: ASD TR 61-193
Author: Semchyshen, M.
Author: Barr, Robert Q.
Corporate Author: Climax Molybdenum Company of Michigan
Laboratory: Materials Central
Date of Publication: 1961-06
Contract: AF 33(616)-6929
Project: 7351
Task: 73512
AD Number: AD0267939

Successful extrusion techniques were developed for several molybdenum-base alloys, tungsten-molybdenum binary alloys, and for unalloyed tungsten. Successful extrusions were performed from 2000 to 3200 F, and at reduction ratios from 4:1 to 8:1. The use of ceramic (Al2O3)-faced extrusion dies was found to reduce the resistance to extrusion and to improve the recovery of sound stock. The problems of die wash and poor bar surfaces associated with high-temperature extrusions through steel dies were circumvented by the ceramic facing.

Many of the extruded bars were converted to bar stock by rolling at 2400 F. The degree of success achieved in preparing bar stock from the extruded bars decreased as the amount of tungsten in the alloy increased.

Good high-temperature tensile and creep-rupture strengths were displayed by the following alloys:

Mo + 1-1/4% Ti + 0.3% Zr + 0.15% C
Mo + 25% W + 0.1% Zr + 0.03% C
Mo + 1-1/2% Cb + 0.5% Ti + 0.3% Zr + 0.3% C.

Strengths of binary alloys of tungsten with 10, 30, or 50% molybdenum were below those of the better molybdenum-base alloys at test temperatures of 2400 F and below. It is postulated that the beneficial effects of tungsten-rich refractory alloys would be realized at higher test temperatures.

A relationship has been proposed to describe the effect of exposure time on the recrystallization behavior of unalloyed molybdenum, Mo + 0.50% Ti, Mo + 0.059% Zr, and Mo +0.49% Ti + 0.057% Zr. The effect of externally applied stresses on the recrystallization behavior of these materials is also treated.

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