| Budget Amount *help |
¥48,360,000 (Direct Cost: ¥37,200,000、Indirect Cost: ¥11,160,000)
Fiscal Year 2009: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2008: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2007: ¥24,180,000 (Direct Cost: ¥18,600,000、Indirect Cost: ¥5,580,000)
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| Research Abstract |
The present research studied mechanical properties of nano-lamellar materials consisting of α_2Ti_3Al phase and γTiAl phase. This type of materials contains a large number of α_2/γ interfaces, which act as obstacles to dislocation motion and improve strength of such materials. Elastic limit of nano-lamellar materials is insensitive to lamellar thickness λ, but the interfaces without misfit dislocation provide a higher elastic limit. Work-hardening rate of nano-lamellar materials is inversely proportional to λ, and the coefficient is increased by the introduction of misfit dislocations. Disappearance of α_2/γ interfaces during high temperature exposure causes degradation of nano-lamellar materials. Bands of β_0 precipitates are formed after dissolution of α_2 lamellae when a β_0 phase forming element is added. The precipitation bands give high creep strength after the disappearance of α_2 lamellar.
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