INVESTIGATION OF THE PHYSICAL METALLURGY OF JOINING TUNGSTEN AND COLUMBIUM
GENERAL ELECTRIC CO CINCINNATI OHIO
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M ETALLOGR PH C ANALYSIS OF NEW BRAZE LLOYS FOR Nb was completed. Studies o he effect of brazing parameters and testing variable on joint re-melt empera ure re continued. Applied stress during t sting was the most important vari bl in control of failure temp rature. New braze alloys for W were evaluated for melting range. Electron beam elted ingots of W -Hf and W-Hf-C alloys were successfully worked to sheet. Gross her al respo se c aracteristics were stablish d tests to deter ine transition temperatures in the wrought, fully recrystallized, and fu ion welded co ditions were begun. No evidence of significant grain boun ry hardening was seen in traverses of symmetrical randomly oriented indenters. Results sho earlier indications of grain bou ary hardening were related to a large hardness anisotropy. Annealing unalloyed Wore experiments confirmed that Be and 316 SS were bo ded. Diffusion of Be into 316 SS results in a brittle joint. The effect of Cr as a diffusion barrier in the Mo-0.5 TiR-41 and Mo0.5 iL-605 systems was investigated. A UTHORA -294 6610in a C-free, ultra-high vacuum environment improves low-temperature ductility. Tensile shear strength of lap joints iffusion bonded between Nb-1Zr and 316 SS, Nb-1Zr to Cu, and Cu o 316 SS was determined. More experiments confirmed that Be and 316 SS were bo ded. Diffusion of Be into 316 SS results in a brittle joint. The effect of Cr as a diffusion barrier in the Mo-0.5 TiR-41 and Mo0.5 iL-605 systems was investigated. A UTHORA -294 6610N2 Brazing alloy system for Nb and W improvement of W alloy duc ility diffusion bonding in welded joints.