Effect of Film Thickness on Fatigue Strength of TiAl Alloy Coated with TiAlN Film at Elevated Temperature

2005 ◽  
pp. 1446-1451
Author(s):  
Takeshi Kasuya ◽  
Hideto Suzuki
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Film Thickness ◽  
Tial Alloy

Effect of Film Thickness on Fatigue Strength of TiAl Alloy Coated with TiAlN Film at Elevated Temperature

2005 ◽  
Vol 297-300 ◽  
pp. 1446-1451 ◽  
Author(s):  
Takeshi Kasuya ◽  
Hideto Suzuki
Keyword(s):  
Thin Film ◽  
Fatigue Strength ◽  
Film Thickness ◽  
Thick Film ◽  
Physical Vapor Deposition ◽  
Tial Alloy ◽  
Testing Machine ◽  
Intermetallic Alloy ◽  
Fracture Control ◽  
The Difference

The fatigue strength of TiAl intermetallic alloy coated with TiAlN film was studied in vacuum at 1073K using a SEM-servo testing machine. In addition, three kinds of TiAlN films were given by physical vapor deposition (1, 3, and 10μ m). The fatigue strength of 3μ m was highest. Also, the fatigue strength of 1μ m was lowest. From this result, existence of optimum film thickness was suggested because the difference of fatigue strength arose in each film thickness. The justification for existence of optimum film thickness is competition of 45-degree crack and 90-degree crack. The 45-degree crack is phenomenon seen in the thin film (1μ m), and is caused by plastic deformation of TiAl substrate. The 45-degree crack is the factor of the fatigue strength fall by the side of thin film. In contrast, the 90-degree crack is phenomenon in the thick film (10μ m), and is caused as result of reaction against load to film. The 90-degree crack is the factor of the fatigue strength fall by the side of thick film. In conclusion, the optimum film thickness can perform meso fracture control, and improves fatigue strength.

scholarly journals 302 Improvement in Fatigue Strength of TiAl Alloy Coated with TiAlN at an Elevated Temperature

2000 ◽  
Vol 2000 (0) ◽  
pp. 67-68
Author(s):  
Hideto SUZUKI ◽  
Harukata KUTSUNA ◽  
Byungjun LEE ◽  
Atsuo KAWANA ◽  
Shinichi NUMATA ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Tial Alloy

Improvement in Fatigue Strength of TiAl Alloy Coated with TiAlN at an Elevated Temperature

2000 ◽  
Vol 2000 (0) ◽  
pp. 357-358
Author(s):  
Hideto SUZUKI ◽  
Harukata KUTSUNA ◽  
Byungjun LEE ◽  
Masaru IKENAGA
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Tial Alloy

Crack-Healing Behavior under Stress and Fatigue Strength at Elevated Temperature of Crack-Healed Si3N4/SiC Composite Ceramics

2001 ◽  
Vol 206-213 ◽  
pp. 819-822 ◽  
Author(s):  
Kotoji Ando ◽  
K. Houjyou ◽  
Min Cheol Chu ◽  
Kunimasa Takahashi ◽  
F. Yao ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Crack Healing ◽  
Composite Ceramics

scholarly journals Application of a √ area -Approach for Fatigue Assessment of Cast Aluminum Alloys at Elevated Temperature

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1033 ◽  
Author(s):  
Roman Aigner ◽  
Christian Garb ◽  
Martin Leitner ◽  
Michael Stoschka ◽  
Florian Grün
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Damage Mechanism ◽  
Cyclic Fatigue ◽  
Fatigue Tests ◽  
Cast Aluminum ◽  
Fatigue Assessment ◽  
Cast Aluminum Alloys

This paper contributes to the effect of elevated temperature on the fatigue strength of common aluminum cast alloys EN AC-46200 and EN AC-45500. The examination covers both static as well as cyclic fatigue investigations to study the damage mechanism of the as-cast and post-heat-treated alloys. The investigated fracture surfaces suggest a change in crack origin at elevated temperature of 150 ∘ C. At room temperature, most fatigue tests reveal shrinkage-based micro pores as their crack initiation, whereas large slipping areas occur at elevated temperature. Finally, a modified a r e a -based fatigue strength model for elevated temperatures is proposed. The original a r e a model was developed by Murakami and uses the square root of the projected area of fatigue fracture-initiating defects to correlate with the fatigue strength at room temperature. The adopted concept reveals a proper fit for the fatigue assessment of cast Al-Si materials at elevated temperatures; in detail, the slope of the original model according to Murakami should be decreased at higher temperatures as the spatial extent of casting imperfections becomes less dominant at elevated temperatures. This goes along with the increased long crack threshold at higher operating temperature conditions.

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