Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting

As the strain rate influences the loading sensitivity of the metallic materials over time, it is very important to assess the associated plastic behavior exposed to a diverse strain rate. Strain rate sensitivity is a fundamental property used to assess the controlling mechanisms of plastic deformati...

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Autores principales:	Md. Minhazul Islam, Parisa Bayati, Mohammadreza Nematollahi, Ahmadreza Jahadakbar, Mohammad Elahinia, Meysam Haghshenas
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Additive manufacturing Laser powder bed fusion NiTi shape memory alloys Indentation strain rate sensitivity Loading rate Mechanics of engineering. Applied mechanics TA349-359 Technology T
Acceso en línea:	https://doaj.org/article/798dfaf89b9a4a099d9d4c940540faf5
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id	oai:doaj.org-article:798dfaf89b9a4a099d9d4c940540faf5
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spelling	oai:doaj.org-article:798dfaf89b9a4a099d9d4c940540faf52021-12-04T04:36:03ZStrain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting2666-359710.1016/j.finmec.2021.100055https://doaj.org/article/798dfaf89b9a4a099d9d4c940540faf52021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666359721000469https://doaj.org/toc/2666-3597As the strain rate influences the loading sensitivity of the metallic materials over time, it is very important to assess the associated plastic behavior exposed to a diverse strain rate. Strain rate sensitivity is a fundamental property used to assess the controlling mechanisms of plastic deformation and the susceptibility of a material to creep. In materials with high strain rate sensitivity, plastic deformation can occur even under the application of a small stress value with relatively low rates of strain. Because of the diverse use of NiTi shape memory alloys in small size applications, it would be crucial to understand how strain rates, locally and on small scale, influence plastic deformation, especially in superelastic conditions. Thus, proper and optimal implementation of their functional properties can be achieved. In this paper, the local strain rate sensitivity of heat-treated NiTi samples in the additive manufactured and cast conditions have been investigated employing depth-sensing indentation testing technique at ambient temperature subjected to various indentation loading rates. To this end, using a self-similar pyramidal (Berkovich) indenter, the materials are loaded with different indentation loading rates of 1, 5, 10, and 50 mN/s to a peak load of 200 mN and then unloaded. Upon conducting the indentation tests, the extracted results including indentation load-depth curves, indentation stress-depth curves, and indentation strain rate sensitivity values have been analyzed and discussed for the cast and additive manufactured materials. Experimental results demonstrate that the hardness values increase linearly with the increase in indentation loading rate while the elastic modulus stays relatively constant. These findings are important in understanding the local and small-scale deformation behavior of additively manufactured NiTi in which properties are location-dependent, as compared with the cast counterparts.Md. Minhazul IslamParisa BayatiMohammadreza NematollahiAhmadreza JahadakbarMohammad ElahiniaMeysam HaghshenasElsevierarticleAdditive manufacturingLaser powder bed fusionNiTi shape memory alloysIndentation strain rate sensitivityLoading rateMechanics of engineering. Applied mechanicsTA349-359TechnologyTENForces in Mechanics, Vol 5, Iss , Pp 100055- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Additive manufacturing Laser powder bed fusion NiTi shape memory alloys Indentation strain rate sensitivity Loading rate Mechanics of engineering. Applied mechanics TA349-359 Technology T
spellingShingle	Additive manufacturing Laser powder bed fusion NiTi shape memory alloys Indentation strain rate sensitivity Loading rate Mechanics of engineering. Applied mechanics TA349-359 Technology T Md. Minhazul Islam Parisa Bayati Mohammadreza Nematollahi Ahmadreza Jahadakbar Mohammad Elahinia Meysam Haghshenas Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting
description	As the strain rate influences the loading sensitivity of the metallic materials over time, it is very important to assess the associated plastic behavior exposed to a diverse strain rate. Strain rate sensitivity is a fundamental property used to assess the controlling mechanisms of plastic deformation and the susceptibility of a material to creep. In materials with high strain rate sensitivity, plastic deformation can occur even under the application of a small stress value with relatively low rates of strain. Because of the diverse use of NiTi shape memory alloys in small size applications, it would be crucial to understand how strain rates, locally and on small scale, influence plastic deformation, especially in superelastic conditions. Thus, proper and optimal implementation of their functional properties can be achieved. In this paper, the local strain rate sensitivity of heat-treated NiTi samples in the additive manufactured and cast conditions have been investigated employing depth-sensing indentation testing technique at ambient temperature subjected to various indentation loading rates. To this end, using a self-similar pyramidal (Berkovich) indenter, the materials are loaded with different indentation loading rates of 1, 5, 10, and 50 mN/s to a peak load of 200 mN and then unloaded. Upon conducting the indentation tests, the extracted results including indentation load-depth curves, indentation stress-depth curves, and indentation strain rate sensitivity values have been analyzed and discussed for the cast and additive manufactured materials. Experimental results demonstrate that the hardness values increase linearly with the increase in indentation loading rate while the elastic modulus stays relatively constant. These findings are important in understanding the local and small-scale deformation behavior of additively manufactured NiTi in which properties are location-dependent, as compared with the cast counterparts.
format	article
author	Md. Minhazul Islam Parisa Bayati Mohammadreza Nematollahi Ahmadreza Jahadakbar Mohammad Elahinia Meysam Haghshenas
author_facet	Md. Minhazul Islam Parisa Bayati Mohammadreza Nematollahi Ahmadreza Jahadakbar Mohammad Elahinia Meysam Haghshenas
author_sort	Md. Minhazul Islam
title	Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting
title_short	Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting
title_full	Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting
title_fullStr	Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting
title_full_unstemmed	Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting
title_sort	strain rate dependent micromechanical properties of niti shape memory alloys: laser powder bed fusion versus casting
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/798dfaf89b9a4a099d9d4c940540faf5
work_keys_str_mv	AT mdminhazulislam strainratedependentmicromechanicalpropertiesofnitishapememoryalloyslaserpowderbedfusionversuscasting AT parisabayati strainratedependentmicromechanicalpropertiesofnitishapememoryalloyslaserpowderbedfusionversuscasting AT mohammadrezanematollahi strainratedependentmicromechanicalpropertiesofnitishapememoryalloyslaserpowderbedfusionversuscasting AT ahmadrezajahadakbar strainratedependentmicromechanicalpropertiesofnitishapememoryalloyslaserpowderbedfusionversuscasting AT mohammadelahinia strainratedependentmicromechanicalpropertiesofnitishapememoryalloyslaserpowderbedfusionversuscasting AT meysamhaghshenas strainratedependentmicromechanicalpropertiesofnitishapememoryalloyslaserpowderbedfusionversuscasting
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Strain rate dependent micromechanical properties of NiTi shape memory alloys: Laser powder bed fusion versus casting

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