镍铬合金中的位错运动与位错反应

对镍铬合金中单一滑移面内和两个滑移面间的位错反应,特别是动态下的反应,进行了透射电子显微镜观察,并对其中的一些位错组态进行了衍衬分析。1.六角位错网络主要是单一滑移面内柏氏矢量相差120°的两组位错间反应的结果;2.与螺型位错一样,刃型或混合型位错也能在两个滑移面间交滑移;3.两个滑移面间的位错反应有时在其截线方向生成不滑动的位错(如L.C.位错锁)并不能完全阻挡住这两个滑移面上的位错运动;4.在含铝、钛的镍铬合金中,超点阵位错的反应与不含铝、钛的合金或无序固溶体中的位错反应相似。 关键词：

MOVEMENT AND INTERACTIONS OF DISLOCATIONS IN NICKEL-CHROMIUM ALLOYS

Interactions of dislocations, especially under dynamic conditions, on a single glide plane or from two crossing glide planes were studied in general, and certain dislocation configurations in particular, by means of transmission electron microscopy and diffraction contrast methods. The main findings are:1. Hexagonal dislocation networks are mainly formed by the interaction of dislocations on a single glide plane with Burgers vectors at 120°.2. Like screw dislocations, edge and mixed dislocations can also cross-slip between two glide planes.3. Interactions of dislocations from two crossing glide planes sometimes form long, straight, non-mobile dislocations at the intersections, e.g., Lomer-Cottrell dislocations. However, this non-mobile dislocation does not block, as it is generally accepted, the movement of dislocations on these two glide planes.4: In nickel-chromium alloys containing aluminum and titanium, interactions of superlattice dislocations are more or less similar to those observed in Al-and Ti-free alloys or in disordered solid solutions.