The material parameters used for describing the micromechanical behavior of each metal are determined from the high-energy X-ray (HEXRD) diffraction data. The evolution of deformation textures in copper and a brass that are representative of fcc metals with different stacking fault energies (SFEs) during cold rolling is predicted using a self-consistent (SC) model. For solution of the problem, it is desirable to develop a highly active flux for gas torch brazing with copper-manganese brazing metals and to study the possibility of the use in cryogenic technology of brazing metals of the copper-manganese system alloyed with nickel. However, this metal wets the surface of copper poorly and flows into the gap only after repeated addition of flux and strong heating of the sample. The joints of copper brazed with P29-76 brazing metal have quite high characteristics of plasticity, which do not change with a reduction in temperature to 77/sup 0/K, indicating their cold resistance at cryogenic temperatures. The joints of steels brazed with the copper-manganese brazing metal do not possess plasticity either at 293/sup 0/K or at 77/sup 0/K. As the test data indicate, with the use of copper-phosphorus brazing metals it is impossible to obtain cold-resistant brazed joints of copper more » and brass. In this work, an investigation was made of the mechanical and production properties of PMFOTsr6-4-0.03, PMFS6-0.15 and P29-76 brazing metals for the purpose of determining the possibility of their use in the production of cryogenic equipment. As replacements for silver brazing metals in brazing joints operating at normal temperatures, brazing metals developed on the basis of copper-phosphorus and copper-manganese alloys are recommended. The acute shortage of silver has made necessary the development and sue of silverfree brazing metals. Cornelis, Acta Metallurgica 18 (1970) 1061.= radiation, and the profiles have been analyzed to evaluate the microstructural parameters. Thesis, University of Leuven, to be published. on the Strength of Metals and Alloys, Asilomar, California (1970) p. on the Strength of Metals and Alloys (1968). Rathenau, Acta Metallurgica 9 (1961) 889. Tensile tests showed that the martensite showed higher and higher elongation values, when plastically deformed, which is due to the progressive increase in fcc phase. the volume fraction of the fcc phase increases with zinc content. When these martensites are plastically deformed, the structure is transformed more and more easily into an fcc lattice, i.e. The detailed study of the X-ray powder diffraction patterns of the as-quenched martensites showed that as zinc is added in increasing amounts, the structure of the Β-type martensite becomes distorted and shows an increasing degree of orthorhombic distortion (i.e. the tendency of the stress-induced transformation to the fcc structure, as zinc is added in increasing amount to copper-aluminium. This study has yielded information on the stability of the crystal structure of Β-type martensite, i.e.
The effect of deformation on the structure of the Β-type martensite has been studied in copper-aluminium and copper-aluminium-zinc alloys by X-ray analysis and mechanical testing.
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