具有不完整的X射线衍射光谱信息的三相材料映射
Xuyang Chang1, Karine Lavernhe-Taillard1, Stéphane Roux1
1Université Paris-Saclay/CentraleSupélec/ENS Paris-Saclay/CNRS, LMPS - Laboratoire de Mécanique Paris-Saclay, F-91190, Gif-sur-Yvette, France.
概括
这项研究引入了一种新的算法,用于在应力下绘制-形状记忆合金中的相位分布. 它揭示了空间不均性和R相和马石变体的缺失衍射数据.
科学领域:
- 材料科学 材料科学 材料科学
- 晶体学 晶体学是指结晶学.
- 固体力学 固体力学是什么
背景情况:
- 同原子-合金表现出由应力诱导的相位转换驱动的形状记忆特性.
- 在单轴拉力负荷下,这些合金从奥氏体 (A) 转变为体 (R),然后转变为马氏体 (M) 变体.
- 这种转换导致由于伪弹性的空间不均性,使相位分析复杂化.
研究的目的:
- 开发一种方法来绘制-合金在拉伸负荷过程中的相位的空间分布.
- 为了同时确定R相的未知衍射光谱,并量化马氏体剥离.
- 为了解决当前现场X射线衍射分析的局限性.
主要方法:
- 在一轴拉伸负荷下,在一个-样本上进行了现场X射线衍射.
- 开发了一种使用正确直角分解 (POD) 与不平等约束的新算法.
- 该算法旨在处理衍射数据并解决相位分布和光谱信息.
主要成果:
- 拟议的算法成功地绘制了奥氏体,R相和马氏体变体的空间分布.
- 该方法为R相提供了以前未知的衍射光谱信息.
- 还确定了马氏体开采的程度,提供了对转化过程的全面了解.
结论:
- 这种基于POD的新算法有效地分析了应力形状记忆合金的现场X射线衍射数据.
- 这种方法克服了表征相变的局限性,并提供了关键的缺失光谱数据.
- 该方法为了解-合金在机械负荷下的复杂行为提供了一个强大的工具.
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