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Effects of local grain misorientation and β-Sn elastic anisotropy on whisker and hillock formation

机译：局部晶粒取向不良和β-Sn弹性各向异性对晶须和小丘形成的影响

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摘要

A whisker and hillock growth model based on local film microstructure, grain misorientation, and elastic strain energy density (ESED) as the driving force for growth was developed to predict preferred sites for growth. Local grain orientations and strains measured by synchrotron microdiffraction in nine regions containing whiskers or hillocks were compared with elastic finite element analysis simulations including Sn elastic anisotropy. Whisker and hillock grains were observed to have higher crystallographic misorientations with neighboring grains than generally observed in the microstructure. While elastic simulations predicted higher local out-of-plane elastic strains and ESEDs at those locations with high misorientations before growth, synchrotron measurements of out-of-plane strains of whisker and hillock grains after growth showed relaxation, with correspondingly low ESEDs calculated from measured strains. Hence, highly localized out-of-plane elastic strains and ESEDs of grains with high relative misorientations with their neighbors determined, at least in part, which grains became whiskers or hillocks.
机译：建立了基于晶须微观结构，晶粒取向错误和弹性应变能密度（ESED）作为生长驱动力的晶须和小丘生长模型，以预测生长的首选位置。通过同步加速器微衍射在9个包含晶须或小丘的区域中的局部晶粒取向和应变与包括Sn弹性各向异性的弹性有限元分析模拟进行了比较。观察到晶须和小丘晶粒与相邻晶粒的晶体学取向差比微观结构中普遍观察到的高。虽然弹性模拟预测在生长前那些取向不良较高的位置处较高的局部平面外弹性应变和ESED，但生长后晶须和岗形晶粒的平面外应变的同步加速器测量显示松弛，而从测量结果计算出的ESED较低株。因此，具有高度相对取向错误的晶粒与其相邻晶粒的高度局部的平面外弹性应变和ESED，至少部分地确定了哪些晶粒成为晶须或小丘。

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  • 来源
    《Journal of Materials Research》 |2013年第5期|747-756785|共11页
  • 作者

    Pylin Sarobol; Wei-Hsun Chen; Aaron E. Pedigo; Peng Su; John E. Blendell; Carol A. HandwerkerR;

  • 作者单位

    School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907;

    School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907;

    Naval Surface Warfare Center Crane Division, Crane, Indiana 47522;

    Component Quality and Technology, Cisco Systems, Inc., San Jose, California 95134;

    School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907;

    School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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