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单词 Widmanstatten figure
释义

Widmanstatten figure

中文百科

魏德曼花纹 Widmanstätten pattern

(重定向自Widmanstatten figure)
在陨石的截面上显示的魏德曼花纹。与座台呈60°角,显示金属板截断处与八面体陨铁的结构平行。
即使魏德曼花纹已经转变,但在锆合金 4, βZr 颗粒的边界依然可以观察到魏德曼花纹。
前述探测的显微照片。
金属显微镜抛光切面呈现的魏德曼花纹。

魏德曼花纹也称为汤姆森结构,是在八面体陨铁的铁陨石和一些橄榄陨铁中发现独特的长镍-铁结晶,它们包括一些交织的锥纹石和镍纹石形成的带状物,称为lamellæ。通常,在壳层的空隙中会发现由锥纹石和镍纹石混合构成,称为合纹石的微小颗粒。

英语百科

Widmanstätten pattern 魏德曼花纹

(重定向自Widmanstatten figure)
Meteorite cross-section, showing Widmanstätten patterns. The 60° angle between the sets of lamellae indicates this plate was cut approximately parallel to the octahedral form of the structure.
Widmanstätten pattern in the Staunton meteorite
 Phase diagram explaining how the pattern forms. First meteoric iron is exclusively composed of taenite. When cooling off it passes a phase boundary where kamacite is exsolved from taenite. Meteoric iron with less than about 6 % Nickel (Hexahedrite) is completely changed to kamacite.
Widmanstätten pattern, metallographic polished section

Widmanstätten patterns, also called Thomson structures, are figures of long nickel-iron crystals, found in the octahedrite iron meteorites and some pallasites. They consist of a fine interleaving of kamacite and taenite bands or ribbons called lamellae. Commonly, in gaps between the lamellae, a fine-grained mixture of kamacite and taenite called plessite can be found. Widmanstätten patterns describe features in modern steels, titanium and zirconium alloys.

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更新时间:2025/6/19 21:51:09