轻量TiVNb中等合金,其强度依赖于温度的弱度
Yan Jiang1, Qian Yang1, Yi-Rong Liu2
1School of Vanadium and Titanium, Panzhihua University, Panzhihua, Sichuan, 617000, China.
--- (TiVNb) 中等合金的化使其结构变粗,但增加了硬度和强度. 合金在800°C保持良好的强度,表现出较弱的温度依赖.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是一种金工业.
- 物理化学 物理化学
背景情况:
- 中等合金 (MEAs) 为高级应用提供可调节的性能.
- 了解TiVNb合金的微结构演变和机械行为至关重要.
- 颗粒粗化和脱位动态显著影响合金性能.
研究的目的:
- 为了研究回火对TiVNb中合金的微观结构和机械性能的影响.
- 为了评估化合金的高温机械性能.
- 为了确定合金强度的温度依赖.
主要方法:
- 通过真空弧融来制备TiVNb合金.
- 在1300°C进行12小时的化处理.
- 微结构特征 (相位分析,粒度大小,位移,纳米带).
- 机械测试 (硬度,拉伸和压力强度) 在室温和高温 (高达800°C).
主要成果:
- 在1300°C的火导致体中心立方体 (BCC) 主导阶段,并且有显著的粒度粗.
- 化合金表现出富含Ti的纳米带,并增加了位移密度.
- 硬度从241.7增加到341.1HV;在室温下拉伸强度达到647MPa,在800°C时达到405MPa.
- 在800°C时,压力承压强度为438 MPa,裂纹减少.
- 在1200°C发生了快速软化,收缩强度降至~50 MPa.
结论:
- 化增强了TiVNb MEAs的硬度和强度,通过微结构修改,如纳米带形成和脱位增加.
- 粗的TiVNb合金在800°C时表现出强大的机械强度,裂纹有限.
- 合金的强度对温度的依赖程度很弱,高达800°C,但在更高的温度 (1200°C) 时会发生显著的软化.
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