在900°C的千兆帕斯卡率强度中,无的TiAl复合合金具有很好的室温可塑性
S S Nene1, A R Balpande1, A Dutta1
1Advanced Materials Design and Processing Group, Department of Materials Engineering, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, 342037, Rajasthan, India. ssnene@iitj.ac.in.
Materials horizons
|October 15, 2025
概括
一种新的无复合金 (TiAl-CA) 在室温下表现出高强度和可成型性,在900°C下表现出优异的氧化耐受性. 它的稳定微观结构为节能航空发动机应用提供了潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 合金设计设计 合金设计
背景情况:
- 胺 (γ-TiAl) 合金对高温应用具有前景,因为它们的密度低,特异强度高.
- 然而,它们的广泛使用受到室温柔性差以及高温下抗氧化性能差的限制.
研究的目的:
- 设计和表征一种新的无复合金 (TiAl-CA),具有增强的机械性能和抗氧化能力.
- 为了研究微观结构与属性关系,控制合金在室温和高温下的性能.
主要方法:
- 合金组成:Ti50Al45Nb2.5Mo1.25Ta0.5W0.5V0.25. 合金组合:Ti50Al45Nb2.5Mo1.25Ta0.5W0.5V0.25. 合金组合:Ti50Al45Nb2.5Mo1.25Ta0.5W0.5V0.25. 合金组合:Ti50Al45Nb2.5Mo1.25Ta0.5W0.5V0.25. 合金组合:Ti50Al45Nb2.5Mo1.25Ta0.5W0.5V0.25. 合金组合:Ti50Al45Nb2.5Mo1.25
- 机械测试:在室温和900°C下测量压力强度和柔性.
- 氧化试验:在900°C的同热暴露96小时以评估氧化抵抗.
- 微结构分析:对相位组成和变形机制的检查.
主要成果:
- 作为造的TiAl-CA在900°C时表现出1.080 GPa的压力强度和在室温下强度-可塑性协同作用 (YS = 1.107 GPa, ε = 0.12).
- 观察到出色的氧化耐受性,在96小时后在900°C时得到1.46毫克厘米-2的受控质量增加.
- 合金的性能归功于其精致的三相微观结构,使其能够滑动,结合和转化可塑性,以及保护性Al2O3 + TiO2氧化层.
结论:
- 开发的TiAl-CA表现出高强度,良好的可塑性和出色的氧化抵抗的独特组合.
- 它在室温和900°C的可比收益率强度表明其特殊的微观结构稳定性.
- 这种合金是燃油效率高的航空发动机中高温结构部件的强有力的候选.
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