γ' 相强化钴基高温合金成分设计与蠕变机理研究进展

冯强, 路松, 李文道, 张晓瑞, 李龙飞, 邹敏, 庄晓黎

Recent Progress in Alloy Design and Creep Mechanism of γ'-Strengthened Co-Based Superalloys

FENG Qiang, LU Song, LI Wendao, ZHANG Xiaorui, LI Longfei, ZOU Min, ZHUANG Xiaoli

图10 CoNi基单晶高温合金中反相畴界-超点阵内禀层错-反相畴界(APB-SISF-APB)结构的形成机制示意图[28]

Fig.10 Formation mechanism of APB-SISF-APB configuration in CoNi-based single crystal superalloys[28] ((1) two closely spaced Shockley partials approach the γ' phase on the (111) glide plane. (2) the leading partial enters the γ' phase, forming a SISF. (3) the trailing partial also enters the γ' phase, transforming the SISF into an APB. (4) the leading partial shears through the entire γ' phase, and the trailing partial forms a closed loop inside the γ' phase. (5) both of leading and trailing partials shear through the entire γ' phase, and partial dislocation loop surrounds an SISF and is embedded in an APB. The bottom-right corner right shows the corresponding dislocation schematic of SISF→APB transformation in the γ' phase. a—lattice constant of γ' phase, FL—dislocation line tension, Fτ —glide force resulting from the resolved shear stress, Ff—net force originating from difference between the APB and SISF energies, bAPB—Burgers vector of APB, bSISF—Burgers vector of SISF)