高ZrのCu-Zr合金の諸性質におよぼす添加元素の影響

Abstract

It has been previously reported that high zirconium Cu-Zr alloy is very interesting as high-strength and high electrical conductivity alloy, compared with conventional low zirconium Cu-Zr alloy containing about 0.3%Zr.Effects of the additional elements on the properties of Cu-about 1.3%Zr alloy were studied, aiming at improvement of their properties. Each element such as Be, Ti, Cr, Fe, Ni, Co, misch metal, Al, Si, As, Ag, Cd, Sb, and Te was added at a rate of less than about 0.5% to the straight alloy. Specimens were cast, hot-worked at about 850°C, solution-annealed at 880°∼890°C for 40 min, quenched and finally cold-rolled by about 83% to become 0.5 mm thickness sheets. Properties of the specimens in various aged states were examined.The results obtained were as follows: (1) Hardness increased with increasing additional elements, excepting the addition of misch metal and Sb which caused a decrease in hardness. (2) Tensile strength was generally improved with increasing additional elements, particularly by the addition of Ti, Cr, Co and a very small amount of Si. (3) Elongation at half-softening-temperature decreased generally with the additions. (4) Electrical conductivity decreased slightly with increasing additional elements except Ti, Fe and Al. (5) Softening resistance and high temperature hardness were improved by the addition of Cr, Co, Si and As. (6) Oxidation resistance was also improved by the additional elements except Te. (7) It was found that the alloys of Cu-Zr-Cr, Cu-Zr-Co and Cu-Zr-Si systems were superior to the others as well as to the binary alloy, as high-strength, conductivity and heat resistance materials.