Al Content Dependence of High-Temperature Vacuum Tensile-Fatigue in α Phase Cu-Al Alloys

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概要

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• High-temperature vacuum tensile-fatigue tests of α phase Cu-Al alloys with 2% Al, 5% Al and 7% Al were made at room temperature 〜500℃ in vacuum (pressure 10^<-5> mmHg). And from their results and results of previous papers [Jour. Japan Soc. Test Mat., Vol. 15 (1966), p. 68 ; Jour. Japan Inst. Metals, Vol. 30 (1966), p. 335 ; Memo. Defense Acad., Vol. 6 (1966), p. 145], Al content and temperature dependences of high-temperature vacuum tensile-fatigue in α phase Cu-Al alloys are studied. Obtained results are as follows : (1) The experimental fatigue formula is expressed by log_eN-log_eN_o=-B [log_ew-log_eW], N_o=α^+c+β^+and B=α'c+β', α^+=0.11+10^3[c wt%^<-1>], β^+=1.5×10^3[c], α'=-0.221[wt%^<-1>] and β'=10,where N is the number of load cycles to cause the failure, w cyclic load, W tensile strength and c Al content (wt%). (2) The tensile strength W is expressed by W=W_oexpA [T-T_o]^2,W_o=αc+β, A=αc+β and T_o=α^*c, and α=3.00 [kg wt%^<-1>], β=19.0 [kg], α=0.74×10^<-6> [^oK^<-2> wt%^<-1>], β=2.2×10^<-6> [^oK^<-2>] and α^*=40[deg wt%<-1>], where T is the testing temperature.

• 一般社団法人日本機械学会の論文

著者

• Matsushima Shigeo

  Department Of Mechanical Engineering The Defense Academy

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