Deformation twinning during high temperature compression tests of the Ni-base superalloy ATI 718Plus®

被引：38
|
作者：
Kienl, Christiane [1 ]
Leon-Cazares, Fernando D. D. [1 ]
Rae, Catherine M. F. [1 ]
机构：
[1] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England
来源：
ACTA MATERIALIA | 2022年 / 225卷
基金：
英国工程与自然科学研究理事会;
关键词：
Deformation twinning; Superalloy; 718Plus; High temperature compression; Stacking fault energy; DYNAMIC RECRYSTALLIZATION; STACKING-FAULTS; GROWTH TWINS; CREEP; MECHANISMS; EVOLUTION; BEHAVIOR; PHASE; MICROSTRUCTURE; DEPENDENCE;
D O I：
10.1016/j.actamat.2019.12.047
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study discusses the deformation mechanisms active during high temperature compression tests of the Ni-base superalloy ATI 718Plus (R). Deformation twins were observed in deformed grains across a range of temperatures and strain rates by use of transmission electron microscopes (TEM). Even at strain rates as low as 0.01 s(-1) and temperatures up to 1025 degrees C the microstructure contained of grains which deformed by deformation twinning. It was concluded that the low stacking fault energy of the alloy, which was measured to be 15mJm(-2) caused the formation of the deformation twins. In addition, several examples of the early stages of twin formation were captured. The twinning partials were in most cases emitted from grain boundaries. In a second instance crosss-lip events from a Frank-Read source lead to the formation of partials which formed stacking faults. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：11
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