Deformation mechanisms of D022 ordered intermetallic phase in superalloys

被引：59

作者：

Lv, D. C. ^{[1
]}

McAllister, D. ^{[1
]}

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

Wang, Y. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, 2041 Coll Rd, Columbus, OH 43210 USA

来源：

ACTA MATERIALIA | 2016年 / 118卷

基金：

美国国家科学基金会;

关键词：

Precipitation hardening; Stacking fault ribbon; Dislocation creep; ab initio calculation; Phase field simulation; BRILLOUIN-ZONE INTEGRATIONS; STACKING-FAULTS; DISLOCATION DISSOCIATION; DOMAIN BOUNDARIES; CORE STRUCTURES; FIELD MODEL; INCONEL; 718; ENERGY; ALLOYS; SLIP;

D O I：

10.1016/j.actamat.2016.07.055

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-temperature alloys in general and superalloys in particular are strengthened by ordered intermetallic phases that are relatively stable at elevated temperatures. Because of their low symmetry, however, these ordered intermetallic phases have rather complicated deformation mechanisms that are difficult to uncover by experiment alone. In this study we use a combination of qb initio calculation and phase field simulation at the elementary defect level to illustrate how dislocations interact with precipitates of an ordered intermetallic phase, r '' (D0(22), tetragonal), the primary strengthening phase in Ni-Nb-Fe-Cr-Ti-Al-Mo alloy (Inconel 718 or IN718 superalloy). A rich variety of new and sophisticated deformation mechanisms are discovered, including a novel mechanism of dislocation generation (accompanied by a spontaneous stacking fault (SF) transition), formation of superlattice intrinsic SF ribbons (SISF-ribbons) and 1/3<112>-type compact super-dislocations, along with ISF shearing and Orowan looping. The predicted deformation microstructures seem to agree with recent electron microscopy observations in IN718. The detailed deformation mechanisms uncovered can be incorporated in constitutive microstructure-property relationships for advanced crystal plasticity modeling and the approach developed can be used to study plastic deformation of other intermetallic phases in different alloy systems. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：350 / 361

页数：12

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