首页|Insights into the role of W/B alloying on high-temperature oxidation behavior of Ti42Al5Mn alloy

Insights into the role of W/B alloying on high-temperature oxidation behavior of Ti42Al5Mn alloy

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In this study,the oxidation behavior of Ti42Al5Mn,Ti42Al5Mn0.5 W,Ti42Al5Mn0.5W0.1B,and Ti42Al5Mn0.8 W was investigated at 800 ℃.Due to the inability to form a dense protective Al2O3 layer,Ti42Al5Mn suffered severe spallation during oxidation at 800 ℃ and the mass gain was significant.The intermediate layer between the scale and the substrate was first composed of Laves/Z phase but changed to α2/Z phase with prolonged oxidation.The intermediate layer with high Ti/Al ratio favors the forma-tion of a thick Al2O3+TiO2 mixed layer in the oxide scale which is prone to initiate cracks and cause the spalling of oxides.The doping of W in TiO2 effectively inhibited its generation and promoted the for-mation of a dense Al2O3 layer,resulting in a significant improvement in the oxidation resistance of the alloy.Compared to Ti42Al5Mn alloy,Ti42Al5Mn0.8 W showed no spallation after 300 h cyclic oxidation and the kinetic curve changed from liner law to parabolic law.The intermediate layer of Ti42Al5Mn0.8 W alloy was composed of a single Laves phase and remained unchanged even after 1000 h oxidation at 800 ℃,offering a favorable basis for the generation of a stable protective oxide layer in the alloy.The addi-tion of 0.1 at.％B to Ti42Al5Mn0.5 W alloy refined its microstructure and further improved its spallation resistance to a level close to that of Ti42Al5Mn0.8 W alloy.

β-γ-TiAlHigh-temperature oxidationTungstenIntermediate layerZ phase

Pengxiang Zhao、Hui Ma、Xiaobing Li、Ming Gao、Yingche Ma、Kui Liu

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Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China

Shenyang National Laboratory for Materials Science,Institute of Metal Research,CAS,Shenyang 110016,China

CAS Key Laboratory of Nuclear Materials and Safety Assessment(NMSA),Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110014,China

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National Natural Science Foundation of China

51971215

2024

10.1016/j.jmst.2023.09.011

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.178(11)
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