镍基单晶高温合金的研发进展

张健, 王莉, 谢光, 王栋, 申健, 卢玉章, 黄亚奇, 李亚微

Recent Progress in Research and Development of Nickel-Based Single Crystal Superalloys

ZHANG Jian, WANG Li, XIE Guang, WANG Dong, SHEN Jian, LU Yuzhang, HUANG Yaqi, LI Yawei

图2 单晶高温合金蠕变变形机制示意图

Fig.2 Schematics of temperature dependence of creep deformation mechanisms for single crystal superalloys (a-c) at medium temperature, the main deformation mechanism is matrix dislocation reaction (a), and at higher stress, dislocation dissociation is also activated (b), both mechanisms in Figs.2a and b lead to the formation of stacking faults (SFs) (c) (σ—applied stress) (d-f) at high temperature, the applied stress and misfit stress impel matrix dislocation reaction at γ/γ' interface during primary creep, and then dislocation networks generate (d), as creep in progress, high local stress and interaction of interfacial dislocations result in the formation of superdislocations, including a<110> type and a<100> type (e), the former is antiphase boundary (APB) coupled with dislocation pair, and the latter is dislocation pair with non-compact core originating from interfacial dislocations. In latter stage, γ'-raft cutting by superdislocations occurs (f)