同时在现场高分辨率电子反射散射衍射和数字图像对应对全场应力-应变的数字图像相关性
Will Gilliland1,2, Tim Ruggles1, Kaitlynn Fitzgerald3
1Materials Characterization,Sandia National Laboratories, Albuquerque, NM 87123, USA.
概括
这项研究引入了一种新的微冲压技术,将数字图像相关性和电子反射散射衍射相结合,用于材料中详细的微观应力和应变分析.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 晶体学 晶体学是指结晶学.
背景情况:
- 全场应力和应变数据对于理解微尺度材料行为和晶体可塑性至关重要.
- 现有的方法,如数字图像相关性 (DIC) 和高分辨率电子反射散射衍射 (HREBSD) 是有效的,但很难同时结合.
- 对于HREBSD的表面准备通常与DIC不兼容,阻碍了同时获取数据.
研究的目的:
- 开发一种方法,在同一地区同时获取DIC和HREBSD数据.
- 为了能够精确校准和验证晶体可塑性模型.
- 为了研究在现场负载下增材制造的多晶Ni超合金在微尺度上的反应.
主要方法:
- 使用微冲压来应用与HREBSD兼容的DIC斑点.
- 对一种增材制造的多晶Ni超合金进行了选择性电子透明斑点化.
- 同时进行了现场加载实验,从同一区域收集了DIC和HREBSD数据.
主要成果:
- 成功结合了DIC和HREBSD在同一样本地区的数据采集.
- 证明了微冲压技术的可行性,用于EBSD兼容的DIC斑点.
- 在现场加载过程中获得并发的微尺度应力和应变数据.
结论:
- 开发的微冲压方法克服了DIC和HREBSD表面制备之间的不兼容性.
- 这种技术允许在微观尺度上同时测量应变和应力.
- 能够对材料行为进行先进的表征,特别是在增材制造的合金中.
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