Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars

Iron-chromium-aluminum (FeCrAl) alloys are used in automobile exhaust gas purifying systems and nuclear reactors due to its superior high-temperature oxidation and excellent corrosion resistance. Single-phase FeCrAl alloys with a body centered cubic structure plastically deform through dislocation s...

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Main Authors:	Dongyue Xie, Binqiang Wei, Wenqian Wu, Jian Wang
Format:	Article
Language:	English
Published:	MDPI AG 2020-10-01
Series:	Crystals
Subjects:	FeCrAl micropillar dislocation grain boundary strain hardening
Online Access:	https://www.mdpi.com/2073-4352/10/10/943

id	doaj-87c090224c0341079c354ddd59b9a5b8
record_format	Article
spelling	doaj-87c090224c0341079c354ddd59b9a5b82020-11-25T03:53:54ZengMDPI AGCrystals2073-43522020-10-011094394310.3390/cryst10100943Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl MicropillarsDongyue Xie0Binqiang Wei1Wenqian Wu2Jian Wang3Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USADepartment of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USADepartment of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USADepartment of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USAIron-chromium-aluminum (FeCrAl) alloys are used in automobile exhaust gas purifying systems and nuclear reactors due to its superior high-temperature oxidation and excellent corrosion resistance. Single-phase FeCrAl alloys with a body centered cubic structure plastically deform through dislocation slips at room temperature. Here, we investigated the orientation dependence of mechanical responses of FeCrAl alloy through testing single-crystal and bi-crystal micropillars in a scanning electron microscopy at room temperature. Single-crystal micropillars were fabricated with specific orientations which favor the activity of single slip system or two slip systems or multiple slip systems. The strain hardening rate and flow strength increase with increasing the number of activated slip system in micropillars. Bi-crystal micropillars with respect to the continuity of slip systems across grain boundary were fabricated to study the effect of grain boundary on slip transmission. The high geometrical compatibility factor corresponds to a high flow strength and strain hardening rate. Experimental results provide insight into understanding mechanical response of FeCrAl alloy and developing the mechanisms-based constitutive laws for FeCrAl polycrystalline aggregates.https://www.mdpi.com/2073-4352/10/10/943FeCrAlmicropillardislocationgrain boundarystrain hardening
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Dongyue Xie Binqiang Wei Wenqian Wu Jian Wang
spellingShingle	Dongyue Xie Binqiang Wei Wenqian Wu Jian Wang Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars Crystals FeCrAl micropillar dislocation grain boundary strain hardening
author_facet	Dongyue Xie Binqiang Wei Wenqian Wu Jian Wang
author_sort	Dongyue Xie
title	Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars
title_short	Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars
title_full	Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars
title_fullStr	Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars
title_full_unstemmed	Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars
title_sort	crystallographic orientation dependence of mechanical responses of fecral micropillars
publisher	MDPI AG
series	Crystals
issn	2073-4352
publishDate	2020-10-01
description	Iron-chromium-aluminum (FeCrAl) alloys are used in automobile exhaust gas purifying systems and nuclear reactors due to its superior high-temperature oxidation and excellent corrosion resistance. Single-phase FeCrAl alloys with a body centered cubic structure plastically deform through dislocation slips at room temperature. Here, we investigated the orientation dependence of mechanical responses of FeCrAl alloy through testing single-crystal and bi-crystal micropillars in a scanning electron microscopy at room temperature. Single-crystal micropillars were fabricated with specific orientations which favor the activity of single slip system or two slip systems or multiple slip systems. The strain hardening rate and flow strength increase with increasing the number of activated slip system in micropillars. Bi-crystal micropillars with respect to the continuity of slip systems across grain boundary were fabricated to study the effect of grain boundary on slip transmission. The high geometrical compatibility factor corresponds to a high flow strength and strain hardening rate. Experimental results provide insight into understanding mechanical response of FeCrAl alloy and developing the mechanisms-based constitutive laws for FeCrAl polycrystalline aggregates.
topic	FeCrAl micropillar dislocation grain boundary strain hardening
url	https://www.mdpi.com/2073-4352/10/10/943
work_keys_str_mv	AT dongyuexie crystallographicorientationdependenceofmechanicalresponsesoffecralmicropillars AT binqiangwei crystallographicorientationdependenceofmechanicalresponsesoffecralmicropillars AT wenqianwu crystallographicorientationdependenceofmechanicalresponsesoffecralmicropillars AT jianwang crystallographicorientationdependenceofmechanicalresponsesoffecralmicropillars
_version_	1724476006719291392

Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars

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