Among aluminium alloy indirect extrusion producing period, various process condition influence different result to the coarse grain structure.
铝合金反向挤压过程中，不同的挤压工艺条件对粗晶组织将产生不同的影响。
The tremolite grain in LuanChuan nephrite is bigger in size, and its structure is somewhat coarse.
该地产出软玉中透闪石颗粒较大，结构稍粗、欠细腻。
The short cracks deflect more severe in coarse grain structure than in fine grain one, result in roughness induced crack closure effect, therefore exhibit slow crack growth rate.
粗晶组织比细晶组织的裂纹偏折更大，粗糙度诱发闭合效应更强，因而裂纹扩展较幔。
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