Near α型耐熱チタン合金の機械的性質に及ぼす合金元素の影響

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The weight reduction of jet engines is very important in order to obtain higher performance. An example is to replace super alloys with titanium alloys to reducing weight. Typical heat resistance titanium alloys are Ti-6242S, Ti-1100, IMI 685 and IMI 834. The balance of mechanical property, creep property, toughness and fatigue property, of IMI 834 is superior to another. This study, effects of content of various alloying elements on mechanical properties of alloys based on IMI 834 are investigated.• Al, Sn and Zr improve the tensile strength at 873K and creep resistance. But they cause great loss of tensile elongation at 297K, if the total aluminum equivalents (Aleq=Al+Sn/3+Zr/6+10[O]) of those elements exceed 9%.• The alloy containing 2.8% Mo has pronounced effect on improving tensile strength and creep resistance.• The alloys above 1% Nb has reduced tensile strength at 873K and creep properties.
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