亚晶粒（subgrain）又称亚颗粒。在多晶体的每一个小晶粒内，晶格位向也并非完全一致，而是存在着许多尺寸很小，位向差很小的小晶块，它们相互镶嵌形成晶粒。是矿物中被亚晶界面分隔开的微区域。
结果表明：随着变形温度的升高和应变速率的减小，位错密度减小，亚晶粒尺寸增大；
The results show that the dislocation density decreases and the subgrain sizes increase with the increase of deformation temperature and the decrease of the strain rate;
结果表明，魏氏组织针由多个块状的亚晶粒组成，亚晶粒边界由位错缠结而成，在亚晶粒内有较高的位错密度；
The results show that Widmansttten structure needle consists of many blocky subgrains that have higher dislocation density and subgrain boundary is made up of dislocation tangle.
超细晶粒钢依靠生成微米级或亚微米级的铁素体，使钢的强度和韧性大大提高。
The strength and toughness of super fine grain steels are greatly increased because of its micrometer or sub micrometer grade grain size.
应用推荐