在循环拉伸训练过程下,Fe-Mn-Si形状记忆合金中的拉伸率依赖热微结构演变
Qian Sun1, Bo Cao1,2, Takeshi Iwamoto3
1School of Civil Aviation, Northwestern Polytechnical University, Xi'an 710072, China.
Materials (Basel, Switzerland)
|March 14, 2026
概括
在循环训练过程中,高拉伸率加速铁基形状记忆合金 (Fe-SMA) 的热力学变化. 这导致更快的内部应力积累,促进马氏体转变,改善结构改造应用的形状恢复.
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.
- 固体力学 固体力学是什么
背景情况:
- 基于铁的形状记忆合金 (Fe-SMAs) 为结构改装提供了具有成本效益的,耐腐蚀的解决方案.
- 应变率对Fe-SMAs循环训练行为的影响需要进一步调查.
研究的目的:
- 研究准静态与冲击应变速率在循环拉伸训练期间对Fe-SMAs的热微结构演变的影响.
- 了解应变速率如何影响转换温度,度和微观结构特征.
主要方法:
- 循环拉伸训练在准静态和冲击应变速率.
- 差分扫描热量计 (DSC) 用于测量转换温度和度.
- 电子反射衍射 (EBSD) 用于分析相位分数,格子扭曲和变异统计.
主要成果:
- 与准静态负载相比,冲击负载导致转换度的更快的增加和热力学驱动力的更明显的减少.
- 较高的张力率导致更快的内部应力和脱位储存的积累,降低了马氏体转换的有效应力.
- EBSD分析显示,冲击训练样本中,格子扭曲增加,单变体马石的比例更高,从而促进转变和增强形状恢复.
结论:
- 应变速率在循环训练期间显著影响Fe-SMAs的合热微结构演变.
- 高张力率加速了热力学变化和微观结构的演变,从而改善了形状恢复.
- 了解这些取决于速率的效应对于优化Fe-SMA在结构改造等应用中至关重要.
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