Promoting the heterogeneous nucleation and the functional properties of directed energy deposited NiTi alloy by addition of La2O3

Lu, Bingwen; Cui, Xiufang; Ma, Wanbiao; Dong, Meiling; Fang, Yongchao; Wen, Xin; Guo, Jingjie; Zeng, Deliang

doi:10.1016/j.addma.2020.101150

Cited by 13 publications

(4 citation statements)

References 44 publications

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“…Since REE can transform the morphology of grains, it is utilized in the MAM to achieve the process of columnar to equiaxed transition (CET), which has been demonstrated in Al alloys [88], Ni alloys [26], and Ti alloys [89]. Tan et al [90] found that when 0.2 wt.% LaB 6 was added in AlSi10Mg alloys, columnar grains were nearly eliminated, and 88% of the equiaxed grains were distributed in the range of 0.5 µm-4.5 µm.…”

Section: Promotion Of Columnar To Equiaxed Transitionmentioning

confidence: 99%

Effects of Rare Earths on Microstructure and Wear Resistance in Metal Additive Manufacturing: A Review

Xiang,

Wang,

Zheng

et al. 2024

Coatings

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Rare earth elements (REEs) doping technology can effectively control the microstructure and improve the quality and performance of materials. This paper summarizes the research progress of REEs in metal additive manufacturing (MAM) in recent years and briefly introduces the effects of REEs on the molten pool fluidity, purified structure, and interfacial bonding between the molten cladding layer and substrate. It focuses on the mechanism of the role of REEs in the refinement and homogenization of microstructures, including grain growth, columnar to equiaxed transition (CET), and elemental segregation. The reasons for the influence of REEs on the homogenization of the structure and elemental segregation are analyzed. The effects of REE type, content, and dimension on hardness and wear resistance are investigated. Finally, tribological applications of REEs in biological and high-temperature environments are summarized, and the impact of REEs-modified alloys is summarized and prospected.

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Section: Promotion Of Columnar To Equiaxed Transitionmentioning

confidence: 99%

Effects of Rare Earths on Microstructure and Wear Resistance in Metal Additive Manufacturing: A Review

Xiang,

Wang,

Zheng

et al. 2024

Coatings

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“…The factor "powder characteristics and preparation protocol" refers to the use of high-purity powders as well as the proper combination of Ni and Ti powders, since there would be no shape-memory effect if the Ni/Ti ratio was not adjusted correctly [122]. The shape-memory effect refers to the occurrence of the martensite↔austenite transformation within a certain temperature range.…”

Section: Powder-bed Fusion (Pbf) 221 Laser Powder-bed Fusion (Lpbf)mentioning

confidence: 99%

Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants

Safavi

Bordbar‐Khiabani

Khalil‐Allafi

et al. 2022

JMMP

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Nickel–titanium (NiTi) is a shape-memory alloy, a type of material whose name is derived from its ability to recover its original shape upon heating to a certain temperature. NiTi falls under the umbrella of metallic materials, offering high superelasticity, acceptable corrosion resistance, a relatively low elastic modulus, and desirable biocompatibility. There are several challenges regarding the processing and machinability of NiTi, originating from its high ductility and reactivity. Additive manufacturing (AM), commonly known as 3D printing, is a promising candidate for solving problems in the fabrication of near-net-shape NiTi biomaterials with controlled porosity. Powder-bed fusion and directed energy deposition are AM approaches employed to produce synthetic NiTi implants. A short summary of the principles and the pros and cons of these approaches is provided. The influence of the operating parameters, which can change the microstructural features, including the porosity content and orientation of the crystals, on the mechanical properties is addressed. Surface-modification techniques are recommended for suppressing the Ni ion leaching from the surface of AM-fabricated NiTi, which is a technical challenge faced by the long-term in vivo application of NiTi.

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“…Additive manufacturing (also known as 3D printing) is a revolutionary cutting-edge manufacturing technology that combines computer-aided design, material processing and molding technologies [1]. It uses the method of gradual accumulation of materials to manufacture solid parts [2,3]. Additive manufacturing can produce parts with complex structures in relatively short manufacturing cycles [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Lanthanum Oxide Addition on Microstructure and Wear Performance of Iron-Chromium Alloy Manufactured by Laser Direct Deposition Additive Manufacturing

et al. 2022

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Additive Manufacturing (AM) has become increasingly common, and its use in various industries is increasing. However, the microstructure, friction and wear performance of metals made by AM, such as the inexpensive and relatively good-performing iron-chromium alloys, require further investigation. Generally, adding rare earth elements can effectively improve the performance of AM alloys, such as tensile strength, wear resistance, corrosion resistance, creep resistance, etc. This work aims to study the variation of microstructure, friction and wear properties of laser additive manufacturing processed iron-chromium alloys after adding different mass fractions of La2O3. The observations obtained by scanning electron microscopy showed that, with the addition of La2O3, the microstructure of AM alloy becomes more uniform and the grains are significantly refined. It is found by friction test that the running-in period is significantly shortened after the addition of La2O3. The coefficient of friction is reduced to a minimum of 0.68. Compared with AM alloys without La2O3, the wear rate of AM alloys with La2O3 is significantly reduced, with a maximum reduction of 38%. Using an optical microscope to observe the surface morphology of the wear scar, it is found that, after adding rare earth oxide, the wear mechanisms changed from adhesive wear and abrasive wear to abrasive wear, with the spalling of hard particles at the same time.

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Promoting the heterogeneous nucleation and the functional properties of directed energy deposited NiTi alloy by addition of La2O3

Cited by 13 publications

References 44 publications

Effects of Rare Earths on Microstructure and Wear Resistance in Metal Additive Manufacturing: A Review

Effects of Rare Earths on Microstructure and Wear Resistance in Metal Additive Manufacturing: A Review

Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants

Effect of Lanthanum Oxide Addition on Microstructure and Wear Performance of Iron-Chromium Alloy Manufactured by Laser Direct Deposition Additive Manufacturing

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