论文部分内容阅读
铁镍合金鱼骨裂纹试样的弧坑裂纹断口,用扫描电镜观察发现了二维等轴树状晶群的真实形貌和该树状晶主干端部的四个对称椭圆凸台及相关的结晶生长线。 经观察研究提出了半熔化区自然晶核生长中产生对称异号螺位错的假说和二维等轴树状晶的对称异号螺位错型层状结晶生成机制。
The crater cracks in the fish-bone-cracked Fe-Ni alloy specimens were observed by scanning electron microscopy. The real morphology of the two-dimensional equiaxed dendrite population and the four symmetrical elliptical bosses and the related Crystal growth line. The hypothesis of dislocation of symmetrical sign and the dislocation of symmetric sign in the natural nucleation of semi-melting zone and the dislocation-like layered crystal of symmetrical sign in two-dimensional equiaxed dendrites have been proposed.