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Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al

Single-crystalline Ni(3)Al-based superalloys have been widely used in aviation, aerospace, and military fields because of their excellent mechanical properties, especially at extremely high temperatures. Usually, single-crystalline Ni(3)Al-based superalloys are welded together by a Ni(3)Al-based pol...

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Autores principales: Qin, Hongbo, Kuang, Tianfeng, Li, Qi, Yue, Xiong, Gao, Haitao, Liu, Fengmei, Yi, Yaoyong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6747771/
https://www.ncbi.nlm.nih.gov/pubmed/31466326
http://dx.doi.org/10.3390/ma12172765
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author Qin, Hongbo
Kuang, Tianfeng
Li, Qi
Yue, Xiong
Gao, Haitao
Liu, Fengmei
Yi, Yaoyong
author_facet Qin, Hongbo
Kuang, Tianfeng
Li, Qi
Yue, Xiong
Gao, Haitao
Liu, Fengmei
Yi, Yaoyong
author_sort Qin, Hongbo
collection PubMed
description Single-crystalline Ni(3)Al-based superalloys have been widely used in aviation, aerospace, and military fields because of their excellent mechanical properties, especially at extremely high temperatures. Usually, single-crystalline Ni(3)Al-based superalloys are welded together by a Ni(3)Al-based polycrystalline alloy via transient liquid phase (TLP) bonding. In this study, the elastic constants of single-crystalline Ni(3)Al were calculated via density functional theory (DFT) and the elastic modulus, shear modulus, and Poisson’s ratio of the polycrystalline Ni(3)Al were evaluated by the Voigt–Reuss approximation method. The results are in good agreement with previously reported experimental values. Based on the calculated mechanical properties of single-crystalline and polycrystalline Ni(3)Al, three-dimensional finite element analysis (FEA) was used to characterize the mechanical behavior of the TLP bonded joint of single-crystalline Ni(3)Al. The simulation results reveal obvious stress concentration in the joint because of the different states of crystal orientation between single crystals and polycrystals, which may induce failure in the polycrystalline Ni(3)Al and weaken the mechanical strength of the TLP bonded joint. Furthermore, results also show that the decrease in the elastic modulus of the intermediate layer (i.e., polycrystalline Ni(3)Al) can relieve the stress concentration and improve the mechanical strength in the TLP bonded joint.
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spelling pubmed-67477712019-09-27 Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al Qin, Hongbo Kuang, Tianfeng Li, Qi Yue, Xiong Gao, Haitao Liu, Fengmei Yi, Yaoyong Materials (Basel) Article Single-crystalline Ni(3)Al-based superalloys have been widely used in aviation, aerospace, and military fields because of their excellent mechanical properties, especially at extremely high temperatures. Usually, single-crystalline Ni(3)Al-based superalloys are welded together by a Ni(3)Al-based polycrystalline alloy via transient liquid phase (TLP) bonding. In this study, the elastic constants of single-crystalline Ni(3)Al were calculated via density functional theory (DFT) and the elastic modulus, shear modulus, and Poisson’s ratio of the polycrystalline Ni(3)Al were evaluated by the Voigt–Reuss approximation method. The results are in good agreement with previously reported experimental values. Based on the calculated mechanical properties of single-crystalline and polycrystalline Ni(3)Al, three-dimensional finite element analysis (FEA) was used to characterize the mechanical behavior of the TLP bonded joint of single-crystalline Ni(3)Al. The simulation results reveal obvious stress concentration in the joint because of the different states of crystal orientation between single crystals and polycrystals, which may induce failure in the polycrystalline Ni(3)Al and weaken the mechanical strength of the TLP bonded joint. Furthermore, results also show that the decrease in the elastic modulus of the intermediate layer (i.e., polycrystalline Ni(3)Al) can relieve the stress concentration and improve the mechanical strength in the TLP bonded joint. MDPI 2019-08-28 /pmc/articles/PMC6747771/ /pubmed/31466326 http://dx.doi.org/10.3390/ma12172765 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Qin, Hongbo
Kuang, Tianfeng
Li, Qi
Yue, Xiong
Gao, Haitao
Liu, Fengmei
Yi, Yaoyong
Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al
title Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al
title_full Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al
title_fullStr Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al
title_full_unstemmed Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al
title_short Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni(3)Al
title_sort stress concentration induced by the crystal orientation in the transient-liquid-phase bonded joint of single-crystalline ni(3)al
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6747771/
https://www.ncbi.nlm.nih.gov/pubmed/31466326
http://dx.doi.org/10.3390/ma12172765
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