Local Phase Transformation Strengthening at Microtwin Boundaries in Nickel-Based Superalloys

被引：27

作者：

Egan, A. J. ^{[1
,2
]}

Xue, F. ^{[3
]}

Rao, Y. ^{[1
]}

Sparks, G. ^{[1
,2
,4
]}

Marquis, E. ^{[3
]}

Ghazisaeidi, M. ^{[1
]}

Tin, S. ^{[5
]}

Mills, M. J. ^{[1
,2
]}

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, 2136 Fontana Lab,140W 19th Ave, Columbus, OH 43210 USA

[2] Ohio State Univ, Ctr Electron Microscopy & Anal, Columbus, OH 43212 USA

[3] Univ Michigan, Dept Mat Sci & Engn, 2300 Hayward St, Ann Arbor, MI 48109 USA

[4] US Air Force, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[5] Univ Arizona, Dept Mat Sci & Engn, 1235 James E Rogers Way, Tucson, AZ 85719 USA

来源：

ACTA MATERIALIA | 2022年 / 238卷

基金：

美国国家科学基金会;

关键词：

Phase transformation; Creep; Deformation twinning; Electron microscopy; Atom probe tomography (APT); STACKING-FAULTS; INTERMEDIATE TEMPERATURES; TENSION/COMPRESSION ASYMMETRY; PLANAR DEFECTS; CREEP STRENGTH; SEGREGATION; MICROSTRUCTURE; MECHANISMS; STABILITY; STRESS;

D O I：

10.1016/j.actamat.2022.118206

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work investigated two similar polycrystalline alloys, differing by only 1 at% Nb content, which elucidated its effect on local phase transformation strengthening during high temperature creep. Compression creep tests were conducted at 750 ? and 600 MPa to 0.5% strain, resulting in deformation dominated by microtwinning. Higher Nb alloy RRHT5 exhibited superior creep strength to RRHT3 in terms of minimum creep rate. The deformation microstructures were characterized via atomic resolution scanning transmission electron microscopy and energy-dispersive spectroscopy, as well as atom probe tomography, which revealed a novel local phase transformation along microtwin interfaces in RRHT5. Orientation specific cECCI and analysis of superlattice intrinsic and extrinsic stacking faults in this alloy deconvolved strengthening effects of other local phase transformations. Density functional theory calculations complemented the experimental results and suggested this was chi phase formation. Increased creep strength of RRHT5 was attributed to local phase transformation along microtwin interfaces, which inhibited deleterious thickening of microtwins and rapid strain accumulation. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：12

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