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Pt-Al涂层对DD413合金高温拉伸性能的影响

WANG Di,HE Lili,WANG Dong,WANG Li, ZHANG Siqian,DONG Jiasheng,CHEN Lijia,ZHANG Jian

Acta Metallurgica Sinica（2023）

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Abstract
利用SEM和TEM对比研究了无涂层和Pt-Al涂层试样在760和980℃的拉伸性能.研究结果表明:在2个温度下,Pt-Al涂层试样的屈服强度均低于无涂层试样.由于Pt-Al涂层存在韧脆转变温度(ductile to brittle transition temperature,DBTT),因此在不同温度下涂层表现出不同的变形机制和裂纹萌生方式.在高温下由于β向γ′转变有利于位错产生滑移,从而导致Pt-Al涂层的塑性变形.Pt-Al涂层在DBTT以上拉伸强度的提高是由于Pt在β-NiAl相中起到固溶强化效应.
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