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首页> 外文期刊>Physica, B. Condensed Matter >Grain boundaries in the refined solidification structure of undercooled Ni75Pd25
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Grain boundaries in the refined solidification structure of undercooled Ni75Pd25

机译：过冷Ni75Pd25细化凝固组织中的晶界

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摘要

When a single-phase alloy solidifies in a low-undercooling range or above a critical undercooling, grain-refined structures are obtained. Taking Ni75Pd25 alloy as an example, the microscopic orientation of the refined grains was investigated by electron backscattered diffraction technology. It is revealed that the refined grains at low undercooling are completely randomly distributed. In the refined structure at high undercooling, certain grain boundaries with misorientation angles less than 5 degrees can be observed, while most of the grain boundaries have large misorientation angles. The inverse pole figure indicates that the refined grains at high undercooling have a textured crystallographic orientation. The fact that twins exist in the refined structure at high undercooling and the dendritic substructure arms exhibit no misorientation supports such an argument that the grain refinement at high undercooling results from the recrystallization of the solidification dendrites. (C) 2008 Elsevier B.V. All rights reserved.
机译：当单相合金在低过冷范围内或高于临界过冷范围内凝固时，会获得晶粒细化的组织。以Ni75Pd25合金为例，通过电子背散射衍射技术研究了细化晶粒的微观取向。结果表明，低过冷度下的细晶粒完全随机分布。在高过冷度下的细化结构中，可以观察到某些取向差角小于5度的晶界，而大多数晶界都具有较大的取向差角。反极图表明在高度过冷状态下精炼的晶粒具有织构的晶体学取向。在高的过冷度下，细化结构中存在孪晶，而树枝状的子结构臂没有取向不良的事实支持了这样的论点，即在高的过冷度下，晶粒细化是由凝固的树枝状晶体的再结晶导致的。 （C）2008 Elsevier B.V.保留所有权利。

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