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Investigation Into the Tungsten-Rich Regions of the Binary Systems Tungsten-Carbon, Tungsten-Boron and Tungsten-Beryllium, Part II.

Report Number: ASD TDR 62-25 Part 2
Author: Goldschmidt, H. J.
Author: Ham, W. M.
Author: Oliver, D. A.
Author: Catherall, E. A.
Corporate Author: The B.S.A. Group Research Centre
Laboratory: AF Materials Laboratory
Date of Publication: 1963-07
Pages: 80
Contract: AF 61(052)-306
Project: 7351 - Metallic Materials
Task: 735101
AD Number: AD0418033

This report deals with the solid solubility of boron and of beryllium in tungsten, together with the attendant problems concerning the tungsten rich borides and beryllides in equilibrium with W, and which are liable to precipitate. Brief supplementary data are given on the W-C system, following the previous investigation. The study of the solubility of boron in tungsten shows this to be approximately 0.2 atomic %B at 2500 C, decreasing with temperature. The atomic nature of this solution presentsa special problem in that it can be interstitial and substitutional. W-W2 B forms a eutectic system, the eutectic temperature being about 2600 C. A high boron boron compound WB BEEN OBSERVED. In the tungsten-beryllium system which presented some special hazards which are described, the solu bility of Be in W is found to be approximately 5 atomic % Be at the eutectic temperature. The solubility limit does not vary appreciably down to 1800 C and decreases to about 3 atomic % Be in the 1000/1300 C range. The solid solution is substitutional, and lattice spacing variations are described.

Lockheed Martin Missiles & Fire Control
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