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Creep Fracture Mechanism of a Single Crystal Nickel Base Alloy Under High Temperature and Low Stress
Xiangfeng Liang,Jili Wu,Yutao Zhao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
This paper reports the creep behavior of a nickel-based single crystal alloy and the creep fracture mechanism under hightemperature and low stress was discussed. The creep curves were analyzed with the Kelvin model. The retardation spectrasuggest that the involved atoms during creep need more relaxation time to achieve the viscous flow, nevertheless, the creepunder the stress of 120 MPa may be caused by the mismatch of dislocation motion and visco-plastic deformation. The fracturemorphologies of crept alloys indicate that the nickel base single crystal alloy presents micro-pore aggregation fracturemechanism under the condition of high temperature and low stress creep.