Effect of microalloying with silicon on high temperature oxidation resistance of novel refractory high-entropy alloy Ta-Mo-Cr-Ti-Al
Effect of microalloying with silicon on high temperature oxidation resistance of novel refractory high-entropy alloy Ta-Mo-Cr-Ti-Al
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DOI：
10.1080/09603409.2017.1389115
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发表时间：
2018-05
影响因子：
1.3
通讯作者：
F. Müller;B. Gorr;H. Christ;Hans Chen;A. Kauffmann;M. Heilmaier
中科院分区：
文献类型：
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作者：
F. Müller;B. Gorr;H. Christ;Hans Chen;A. Kauffmann;M. Heilmaier
摘要1原子%研究了Si对Ta-Mo-Cr-Ti-Al高熵耐热合金（HEA）在900 °C ~ 1100 °C空气中抗高温氧化性能的影响。Ta-Mo-Cr-Ti-Al和Ta-Mo-Cr-Ti-Al-1 Si的热重曲线表明，由于形成了富铬和氧化铝保护膜，其质量变化较小，氧化速率较低，与形成氧化铬的合金相当。两种合金在所有温度下形成的氧化皮是复杂的，由最外层的TiO 2，中间体Al 2 O3，和（Cr，Ta，Ti）-丰富的氧化物在界面氧化物/基板。在所有温度下，Si的添加对抗氧化性有轻微的不利影响，主要是由于在含Si的HEA中观察到的内部腐蚀攻击增加。在含硅合金中明显发现的大Laves相颗粒被认为是导致更快速内腐蚀的原因。
Abstract The effect of 1 at.% Si addition to the refractory high-entropy alloy (HEA) Ta–Mo–Cr–Ti–Al on the high temperature oxidation resistance in air between 900 °C and 1100 °C was studied. Due to the formation of protective chromia-rich and alumina scales, the thermogravimetric curves for Ta–Mo–Cr–Ti–Al and Ta–Mo–Cr–Ti–Al–1Si showed small mass changes and low oxidation rates which are on the level of chromia-forming alloys. The oxide scales formed on both alloys at all temperatures are complex and consist of outermost TiO2, intermediate Al2O3, and (Cr, Ta, Ti)-rich oxide at the interface oxide/substrate. The Si addition had a slightly detrimental effect on the oxidation resistance at all temperatures primarily as a result of increased internal corrosion attack observed in the Si-containing HEA. Large Laves phase particles distinctly found in the Si-containing alloy were identified to be responsible for the more rapid internal corrosion.