Friction stir processing of a metastable β titanium alloy in β and α+β phase fields

Shape memory based high performance nickel-titanium alloy particles were embedded by friction stir processing in graded concentration on the surface of light weight commercially pure magnesium cast plates. The novel functionally graded material so developed was analyzed for microhardness evolution and vibration damping effect. The nickel-titanium alloy particles were filled in a 2.5 wide × 3 mm deep slot and embedded on the surface by friction stir processing. A shallower slot 2.5 wide × 1.5 mm deep was milled over the previously embedded surface in which nickel-titanium alloy powder was again filled and embedded on the surface by second pass friction stir processing. This sequence of pass created the graded variation in nickel-titanium alloy concentration. The so fabricated functionally graded material was cut out from the plate and it was hot-forged to 2/3 thickness and subsequently quenched. The microstructural examination confirmed homogeneous dispersion of nickel-titanium alloy particles and clear interface between high and low concentration regions. The microhardness confirmed a uniform graded variation in hardness. The vibration damping tests confirm considerable improvement in the damping capacity of the fabricated functionally graded material.

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Friction Stir Processing of Metastable Beta Titanium Alloy Ti- 5Al-5Mo-5V-3Cr

Proceedings of the 13th World Conference on Titanium ◽

10.1002/9781119296126.ch40 ◽

2016 ◽

pp. 269-273

Author(s):

Shanoob Balachandran ◽

Rajiv S. Mshra ◽

Dipankar Banerjee

Keyword(s):

Titanium Alloy ◽

Friction Stir Processing ◽

Beta Titanium Alloy ◽

Friction Stir ◽

Beta Titanium ◽

Metastable Beta

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Friction Stir Processing Trials of SP-700 (Ti-4.5Al-3V-2Fe-2Mo) Titanium Alloy

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.385.349 ◽

2018 ◽

Vol 385 ◽

pp. 349-354

Author(s):

Hamed Mofidi Tabatabaei ◽

Chiaki Okuyama ◽

Tadashi Nishihara ◽

Takahiro Ohashi

Keyword(s):

Titanium Alloy ◽

Friction Stir Processing ◽

Temperature Measurements ◽

Nominal Composition ◽

Friction Stir ◽

Automotive Components ◽

Beta Alloy ◽

Fine Microstructure ◽

Alpha Beta

Superplastic titanium alloy (SP-700 with nominal composition of Ti-4.5Al-3V-2Fe-2Mo) an alpha-beta alloy, with a beta-rich fine microstructure and excellent superplastic formability has wide applications in aerospace components, metal wood heads, tools, automotive components. However, very little information is available regarding friction stir processing (FSP) characteristics of this alloy. This study discusses the trials of FSP of this highly formable titanium alloy. Results are discussed in terms of hardness and temperature measurements and microstructural observations.

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Characterization of Friction Stir Welded Joints in TA15 Titanium Alloy Plates

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.138-139.852 ◽

2011 ◽

Vol 138-139 ◽

pp. 852-857

Author(s):

Fei Fei Xie ◽

Chun Ping Huang ◽

Chun Lin Dong ◽

Li Ming Ke

Keyword(s):

Tensile Strength ◽

Titanium Alloy ◽

Welded Joints ◽

Travel Speed ◽

Flow State ◽

Friction Stir ◽

Β Phase ◽

Transverse Tensile ◽

Plastic Materials ◽

Ta15 Titanium Alloy

Friction stir welding (FSW) was applied to TA15 titanium alloy plates. Welds were produced by employing rotational speed of 375rpm and a travel speed of 23.5mm/min.The microstructure and mechanical properties of friction stir welded joints were investigated. Flow pattern of the materials also were analysed. The stir zone (SZ) was characterized by α-phase and β-phase, but the size of the grain in the middle of the SZ was much finer than that of the upper. The interface between the base metal (BM) and SZ is associated with the flow state of the plastic materials. Results of transverse tensile test indicated that all the joints exhibited lower tensile strength than the BM, and the maximum tensile strength of the as-welded joint is about 97.6% of the average strength of the BM.

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Friction Stir Processing of Additively Manufactured Ti-6Al-4V Alloy: Structure Modification and Mechanical Properties

Metals ◽

10.3390/met12010055 ◽

2021 ◽

Vol 12 (1) ◽

pp. 55

Author(s):

Kirill Kalashnikov ◽

Andrey Chumaevskii ◽

Tatiana Kalashnikova ◽

Andrey Cheremnov ◽

Evgeny Moskvichev ◽

...

Keyword(s):

Titanium Alloy ◽

Friction Stir Processing ◽

Growth Direction ◽

Material Strength ◽

Material Structure ◽

Strength Increase ◽

Friction Stir ◽

Nickel Based Superalloy ◽

Columnar Grain ◽

Tensile Strength Increase

This work explores the possibility of using friction stir processing to harden the Ti-6Al-4V titanium alloy material produced by wire-feed electron beam additive manufacturing. For this purpose, thin-walled workpieces of titanium alloy with a height of 30 cm were printed and, after preparation, processed with an FSW-tool made of heat-resistant nickel-based superalloy ZhS6U according to four modes. Studies have shown that the material structure and properties are sensitive to changes in the tool loading force. In contrast, the additive material’s processing direction, relative to the columnar grain growth direction, has no effect. It is shown that increasing the axial load leads to forming a 𝛽-transformed structure and deteriorates the material strength. At the same time, compared to the additive material, the ultimate tensile strength increase during friction stir processing can achieve 34–69%.

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A Review on Friction Stir Processing of Titanium Alloy: Characterization, Method, Microstructure, Properties

Metallurgical and Materials Transactions B ◽

10.1007/s11663-019-01634-9 ◽

2019 ◽

Vol 50 (5) ◽

pp. 2134-2162 ◽

Cited By ~ 10

Author(s):

Zihao Ding ◽

Qing Fan ◽

Liqiang Wang

Keyword(s):

Titanium Alloy ◽

Friction Stir Processing ◽

Friction Stir

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Gradient Microstructures and Mechanical Properties of Ti-6Al-4V/Zn Composite Prepared by Friction Stir Processing

Materials ◽

10.3390/ma12172795 ◽

2019 ◽

Vol 12 (17) ◽

pp. 2795

Author(s):

Yuting Lv ◽

Zihao Ding ◽

Xueyan Sun ◽

Lei Li ◽

Gang Sha ◽

...

Keyword(s):

Mechanical Properties ◽

Electron Microscope ◽

Friction Stir Processing ◽

Atom Probe ◽

Phase Region ◽

Friction Stir ◽

Β Phase ◽

The Matrix ◽

Potential Applications ◽

Microstructures And Mechanical Properties

In this work, a biomedical Ti-6Al-4V (TC4)/Zn composite with gradient microstructures was successfully prepared by friction stir processing (FSP). The microstructures and mechanical properties of the composite were systematically studied using scanning electron microscope (SEM), X-ray diffractometer (XRD), transmission electron microscope (TEM), atom probe tomography (APT), and microhardness test. The results show that TC4/Zn composite can be successfully prepared, and gradient microstructures varying from coarse grain to nanocrystalline is formed from the bottom to the upper surface. During FSP, adding Zn can accelerate the growth of β phase region, and the grain size significantly increases with the increasing rotation rate. The grain combination is the main mechanism for grain growth of β phase region. The deformation mechanisms gradually change from dislocation accumulations and rearrangement to dynamic recrystallization from the bottom to the upper surface (1.5 mm–150 μm from the upper surface). The composite exhibits slightly higher microhardness compared with the matrix. This paper provides a new method to obtain a TC4/Zn composite with gradient surface microstructures for potential applications in the biomedical field.

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