|Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy|
|E. D. Wu; G. A. Sun; B. Chen; J. Zhang; V. Ji; V. Klosek; M. H. Mathon
|Source Publication||Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
|Abstract||A single crystal superalloy with initial sample axis 10 deg deviated from  was creep deformed at 1273 K (1000 degrees C) 235 MPa and its triaxial strain/stress state and subgrain defects were studied by neutron diffraction. Normal internal stresses with their directions close to the loading axis and their scales smaller than those perpendicular to the axis were observed and attributed to a lattice rotation toward  pole. The internal stress at a level approaching to the loading stress and mostly in the state of interphase stress was induced during the first stage of creep prior to rafting and associated to lattice rotation, microstrain relaxation and line-up of misoriented gamma'-precipitates. The internal stress was diminished and released at final stage of creep associated with a reduction in unit-cell volume and a transition of strain/stress state between the two phases. The observation was explained by development of dislocations and raft structure during creep. (C) The Minerals, Metals & Materials Society and ASM International 2013|
; zhang, jian] inst met sci & technol, shenyang natl lab mat sci, shenyang 110016, peoples r china. [sun, guangai
; chen, bo] inst nucl phys & chem, mianyang 621900, peoples r china. [ji, vincent] univ paris 11, lemhe icmmo, umr 8182, f-91405 orsay, france. [klosek, vincent
; mathon, marie-helene] cea saclay, lab leon brillouin, f-91191 gif sur yvette, france.
; wu, ed (reprint author), inst met sci & technol, shenyang natl lab mat sci, shenyang 110016, peoples r china.
E. D. Wu,G. A. Sun,B. Chen,et al. Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2014,45A(1):139-146.
E. D. Wu.,G. A. Sun.,B. Chen.,J. Zhang.,V. Ji.,...&M. H. Mathon.(2014).Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,45A(1),139-146.
E. D. Wu,et al."Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 45A.1(2014):139-146.
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