EFFECT OF NANOCRYSTALLIZATION ON THE OXIDATIONAND CORROSION RESISTANCE OF Ti48Al8Cr2Ag ALLOY

J Chin Soc Corr Pro

2005, Vol. 25

Issue (3): 135-141 DOI:

Research Report

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EFFECT OF NANOCRYSTALLIZATION ON THE OXIDATIONAND CORROSION RESISTANCE OF Ti48Al8Cr2Ag ALLOY

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中国科学院金属研究所

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Abstract Magnetronsputter deposition was used to produce a Ti48Al8Cr2Ag(at.%)coating on the cast alloy.The oxidation and corrosion behavior of the cast Ti48Al8Cr2Ag alloy and its sputtered coating were investigated in air at 900℃～1000℃.Results indicated that the sputtered nanocrystal line coating showed lower oxidation rate than the cast alloy at 900℃,because the former formed a scale of exclusively Al2O3 and the latter formed mixed scale of Al2O3+TiO2 in some areas.However,the nanocrystalline showed a little bit higher oxidation rate than the cast alloy at 1000℃,because spherical surface and boundaries of free surface between columnar of the coating gave a larger actual oxidation area than the cast alloy.Compared to nanocrystallization coatin g,the cast alloy exhibits worse corrosion resistance because of mixed scale of TiO2+Al2O3 at 600℃ and 700℃.

Key words: TiAlCrAg nanocrystalline coating high temperature oxidation corrosion

Received: 05 January 2004

ZTFLH:

TG174.444，TG174.2+1

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. EFFECT OF NANOCRYSTALLIZATION ON THE OXIDATIONAND CORROSION RESISTANCE OF Ti48Al8Cr2Ag ALLOY. J Chin Soc Corr Pro, 2005, 25(3): 135-141 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I3/135

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