Zr銅の時効硬化に関する研究

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書誌事項

タイトル別名
  • Studies on Copper-Zirconium Alloys
  • Zr ドウ ノ ジコウ コウカ ニ カンスル ケンキュウ

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抄録

Alloys used for essential parts of air-crafts and missiles are often required to have both high strength and high electric conductivity at high temperature in order to stand the severe conditions such as high speed rotation, etc. The copper-zirconium alloys have been spot lighted as new alloys that can cope with such severe conditions. The authors have made a systematical study of the electrical properties and temperature characteristics of these alloys. At first, the effect of zirconium contents to the electrical and mechanical properties of copper-zirconium alloys was studied and then the best conditions for heat treatment were searched. The specimens were at first hot-rolled, and then they were given solution treatment at 800∼850°C, cold-rolled 50∼75% and then aged at 400∼450°C. When the alloy was heated between 100°C and 600°C after solution treatment, a little hardening by aging was observed, but when cold-rolled after solution treatment, fairly remarkable hardening by aging was observed in the case of alloys with minimum 0.1% of zirconium. Consequently, such alloys have high heat resistance and have hardness of no less than VHN 130∼140 and the tensile strength of 60 kg/mm2 after heating at the temperature of up to 400°C. The electrical conductivity was reduced as the content of zirconium increased, but it recovered considerably by aging treatment. For example it recovered to IACS 90% at minimum in the case of alloy containing 0.1% zirconium. On the contrary, the mechanical strength increased as the content of zirconium increased. According to the results of the study on solution-temperatures, the electrical conductivity was reduced as the solution-temperature rose, while the hardness rose to maximum at about 900°C. Taking both factors into consideration, the temperature from 800°C to 850°C is the most suitable. The softening temperature leaped up when the zirconium content went over 0.1% and softening did not begin until the temperature rose above 500°C.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (8), 489-493, 1961

    公益社団法人 日本金属学会

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