Microstructure and phase transformation of nickel-titanium shape memory alloy fabricated by directed energy deposition with in-situ heat treatment

Gao, Shiming; Bodunde, Ojo P.; Qin, Mian; Liao, Wei-Hsin; Guo, Ping

doi:10.1016/j.jallcom.2021.162896

Cited by 18 publications

(2 citation statements)

References 61 publications

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“…Due to the austenitic-martensitic phase transitions, NiTi alloy has a shape memory effect and superelasticity-the ability to fully recover its original shape after removal of an external load, which can significantly exceed the yield strength of the material [41,42]. At normal atmospheric pressure, NiTi has the relatively high liquidus temperature T l 1580 K, which allows this alloy to be classified as heat resistant [43]. Therefore, NiTi is widely used in the aerospace, automotive, electronics and biomedical industries, for example, in the manufacture of self-sealing thermomechanical joints, thermally sensitive mechanical actuators, robotic elements, electronic device actuators, instruments and implants for cranio-cerebral and maxillofacial surgery, traumatology, orthopaedics, etc.…”

Section: Introductionmentioning

confidence: 99%

A Unified Empirical Equation for Determining the Mechanical Properties of Porous NiTi Alloy: From Nanoporosity to Microporosity

Galimzyanov,

Nikiforov,

Anikeev

et al. 2023

Crystals

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The mechanical characteristics of a monolithic (non-porous) crystalline or amorphous material are described by a well-defined set of quantities. It is possible to change the mechanical properties by introducing porosity into this material; as a rule, the strength values decrease with the introduction of porosity. Thus, porosity can be considered an additional degree of freedom that can be used to influence the hardness, strength and plasticity of the material. In the present work, using porous crystalline NiTi as an example, it is shown that the mechanical characteristics such as the Young’s modulus, the yield strength, the ultimate tensile strength, etc., demonstrate a pronounced dependence on the average linear size l¯ of the pores. For the first time, an empirical equation is proposed that correctly reproduces the dependence of the mechanical characteristics on the porosity ϕ and on the average linear size l¯ of the pores in a wide range of sizes: from nano-sized pores to pores of a few hundred microns in size. This equation correctly takes into account the limit case corresponding to the monolithic material. The obtained results can be used directly to solve applied problems associated with the design of materials with the necessary combination of physical and mechanical characteristics, in particular, porous metallic biomaterials.

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Section: Introductionmentioning

confidence: 99%

A Unified Empirical Equation for Determining the Mechanical Properties of Porous NiTi Alloy: From Nanoporosity to Microporosity

Galimzyanov,

Nikiforov,

Anikeev

et al. 2023

Crystals

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“…(a)-(c) Variations in the DSC curves when the scanning speed, scanning spacing, and laser power are changed; (d) linear relationship between each parameter and the peak temperature of martensitic transformation 7 Effect of remelting process on the properties of additively manufactured metal functional materials. (a)-(b) Effect of remelting of SLM Cu -Al -Ni -Mn alloy interlayers on the microstructure and austenite phase transformation peak temperature [90] ; (c) principle of laser insitu heat treatment in L -DED [91] ; (d) NiTi alloy with insitu laser heat treatment behaves larger enthalpy of phase transition [91] 1002305 -8 11 Insitu synchrotron XRD was used to characterize the stressinduced martensitic phase transformation of NiTi SMAs [66] MicroXAS/ MS beamline X-ray energy 24 keV [40][41] /61.3 keV [49][50] 79 keV [48] , 98.02 keV [55,108] , 103.43 keV [54] 20 keV [42][43] 68.4 keV [47] 9.3 keV [45] , 12 keV [44] , 17.2 keV [49] 1002305 -11 [52][53] 70 keV [51] Highenergy white/ monochromatic light [112] 特邀综述…”

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confidence: 99%

激光增材制造金属功能材料及其原位同步辐射研究（特邀）

Li Guanqi,

Zhang Dongsheng,

Zheng Jiaxing

et al. 2024

中国激光

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Significance Laser additive manufacturing is a technology that utilizes a laser beam to melt and mold powders layer by layer based on a 3D model. It has made outstanding progress in the molding of metallic structural materials such as large and complex structural 1002305 -21 特邀综述第 51 卷第 10 期/2024 年 5 月/中国激光 parts in the aerospace industry. Laser additive manufacturing has also achieved remarkable progress in the fabrication of metallic functional materials. Shape memory alloys are a type of metallic functional materials that exhibit shape memory, superelasticity, and elastocaloric effects. Through design and optimization of the process strategy, shape memory alloys with excellent functional properties and complex shapes could be fabricated by laser additive manufacturing. Laser additive manufacturing offers an effective method to research metallic functional materials with outstanding performance that can meet the application requirements.Progress In this paper, we systematically summarize the research on laser additive manufacturing of metallic functional materials and their characterization by insitu synchrotron radiation. We further introduce the research progress on laser additive manufacturing of highperformance shape memory alloys as well as the latest progress of metal L -PBF and L -DED technologies for synchrotron radiationbased insitu Xray diffraction (XRD) research. In the first part of this paper, the dominant types of laser additive manufacturing and their basic principles are introduced. On this basis, the relationship between the functional properties of shape memory alloys and the parameters of the process strategy is revealed. This relationship offers a guideline for how to fabricate a shape memory alloy with targeted properties. In the next part, the research progress on highdensity shape memory alloys fabricated through laser additive manufacturing is introduced. The guidance of results predicted by computer is convenient for selecting the combinations of parameters that could be used to fabricate shape memory alloys with high density. The final part presents the research progress on synchrotron radiationbased insitu Xray characterization in the laser additive manufacturing process. This part introduces the characterization platform and typical applications of insitu XRD in the laser additive manufacturing process of metallic materials. We describe some scenarios involving the phase transition dynamics measurement and insitu characterization methods of single crystals in additive manufacturing. We also present the future development trends. Conclusions and ProspectsThe molten pool in L -PBF and L -DED metal additive manufacturing processes has the characteristics of nonequilibrium and rapid solidification, and the microstructure of metallic functional materials can be controlled by adjusting the parameters of these processes. The additive manufacturing process may produce microdefects such as keyholes and lack of melting, and it also tends to form columnar crystals with a certain orientation. ...

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Effect of Annealing on the Microstructure, Phase Composition and Microhardness of the Ni–Ti Alloy Produced by Wire-Feed Electron-Beam Additive Manufacturing

Astafurova,

Luchin,

Nifontov

et al. 2024

Russ Phys J

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Microstructure and phase transformation of nickel-titanium shape memory alloy fabricated by directed energy deposition with in-situ heat treatment

Cited by 18 publications

References 61 publications

A Unified Empirical Equation for Determining the Mechanical Properties of Porous NiTi Alloy: From Nanoporosity to Microporosity

A Unified Empirical Equation for Determining the Mechanical Properties of Porous NiTi Alloy: From Nanoporosity to Microporosity

激光增材制造金属功能材料及其原位同步辐射研究（特邀）

Effect of Annealing on the Microstructure, Phase Composition and Microhardness of the Ni–Ti Alloy Produced by Wire-Feed Electron-Beam Additive Manufacturing

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