Simultaneous grain refinement and nanoscale spinodal decomposition of β phase in Ti-Nb-Ta-Zr alloy induced by ultrasonic mechanical impacts

Mehdi Kheradmandfard; Seyed Farshid Kashani-Bozorg; Kyeong Hee Kang; Oleksiy V. Penkov; Abbas Zarei Hanzaki; Young Shik Pyoun; Auezhan Amanov; Dae Eun Kim

doi:10.1016/j.jallcom.2017.12.049

Simultaneous grain refinement and nanoscale spinodal decomposition of β phase in Ti-Nb-Ta-Zr alloy induced by ultrasonic mechanical impacts

Mehdi Kheradmandfard, Seyed Farshid Kashani-Bozorg, Kyeong Hee Kang, Oleksiy V. Penkov, Abbas Zarei Hanzaki, Young Shik Pyoun, Auezhan Amanov, Dae Eun Kim

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

It was found that ultrasonic nanocrystal surface modification (UNSM) treatment performed on Ti-Nb-Ta-Zr (TNTZ) alloy surface to produce a gradient nanostructured surface layer also resulted in the nano-scale spinodal decomposition of β phase. For the first time, nano-scale spinodal decomposition of β phase induced by ultrasonic mechanical impacts was observed in a short time without any age treatment. The peak shift of XRD to lower angles, (110) β XRD peak splitting, overlapped and asymmetric XRD peaks, satellite reflections in the SAED pattern, and lattice straining in HR-TEM images confirmed nano-scale spinodal decomposition of β phase in the TNTZ alloy induced by UNSM treatment. Nano-scale EDS line-scan probe analysis revealed the β phase separation into nano-scale domains of Ti-rich (β₁) and Ti-depleted (β₂) phases. HR-TEM images showed the semi-coherent arrangement of Ti-rich (β₁) and Ti-depleted (β₂) regions. Nanosized grain formation and spinodal decomposition of β phase were induced simultaneously by UNSM treatment. The nano-scale grains, high dislocation density, and semi-coherent interface between the spinodally separated phases contributed to the high hardness of the UNSM-treated TNTZ alloy specimen.

Original language	English
Pages (from-to)	540-549
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	738
DOIs	https://doi.org/10.1016/j.jallcom.2017.12.049
Publication status	Published - 2018 Mar 25

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2010–0018289 ).

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2010–0018289).

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Kheradmandfard, M., Kashani-Bozorg, S. F., Kang, K. H., Penkov, O. V., Zarei Hanzaki, A., Pyoun, Y. S., Amanov, A., & Kim, D. E. (2018). Simultaneous grain refinement and nanoscale spinodal decomposition of β phase in Ti-Nb-Ta-Zr alloy induced by ultrasonic mechanical impacts. Journal of Alloys and Compounds, 738, 540-549. https://doi.org/10.1016/j.jallcom.2017.12.049

Kheradmandfard, Mehdi ; Kashani-Bozorg, Seyed Farshid ; Kang, Kyeong Hee ; Penkov, Oleksiy V. ; Zarei Hanzaki, Abbas ; Pyoun, Young Shik ; Amanov, Auezhan ; Kim, Dae Eun. / Simultaneous grain refinement and nanoscale spinodal decomposition of β phase in Ti-Nb-Ta-Zr alloy induced by ultrasonic mechanical impacts. In: Journal of Alloys and Compounds. 2018 ; Vol. 738. pp. 540-549.

@article{38e6194ca75945eead08feda4ec761f4,

title = "Simultaneous grain refinement and nanoscale spinodal decomposition of β phase in Ti-Nb-Ta-Zr alloy induced by ultrasonic mechanical impacts",

abstract = "It was found that ultrasonic nanocrystal surface modification (UNSM) treatment performed on Ti-Nb-Ta-Zr (TNTZ) alloy surface to produce a gradient nanostructured surface layer also resulted in the nano-scale spinodal decomposition of β phase. For the first time, nano-scale spinodal decomposition of β phase induced by ultrasonic mechanical impacts was observed in a short time without any age treatment. The peak shift of XRD to lower angles, (110) β XRD peak splitting, overlapped and asymmetric XRD peaks, satellite reflections in the SAED pattern, and lattice straining in HR-TEM images confirmed nano-scale spinodal decomposition of β phase in the TNTZ alloy induced by UNSM treatment. Nano-scale EDS line-scan probe analysis revealed the β phase separation into nano-scale domains of Ti-rich (β1) and Ti-depleted (β2) phases. HR-TEM images showed the semi-coherent arrangement of Ti-rich (β1) and Ti-depleted (β2) regions. Nanosized grain formation and spinodal decomposition of β phase were induced simultaneously by UNSM treatment. The nano-scale grains, high dislocation density, and semi-coherent interface between the spinodally separated phases contributed to the high hardness of the UNSM-treated TNTZ alloy specimen.",

author = "Mehdi Kheradmandfard and Kashani-Bozorg, {Seyed Farshid} and Kang, {Kyeong Hee} and Penkov, {Oleksiy V.} and {Zarei Hanzaki}, Abbas and Pyoun, {Young Shik} and Auezhan Amanov and Kim, {Dae Eun}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2010–0018289 ). Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2010–0018289).",

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doi = "10.1016/j.jallcom.2017.12.049",

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Simultaneous grain refinement and nanoscale spinodal decomposition of β phase in Ti-Nb-Ta-Zr alloy induced by ultrasonic mechanical impacts. / Kheradmandfard, Mehdi; Kashani-Bozorg, Seyed Farshid; Kang, Kyeong Hee; Penkov, Oleksiy V.; Zarei Hanzaki, Abbas; Pyoun, Young Shik; Amanov, Auezhan; Kim, Dae Eun.

In: Journal of Alloys and Compounds, Vol. 738, 25.03.2018, p. 540-549.

Research output: Contribution to journal › Article › peer-review

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AU - Kheradmandfard, Mehdi

AU - Kashani-Bozorg, Seyed Farshid

AU - Kang, Kyeong Hee

AU - Penkov, Oleksiy V.

AU - Zarei Hanzaki, Abbas

AU - Pyoun, Young Shik

AU - Amanov, Auezhan

AU - Kim, Dae Eun

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2010–0018289 ). Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2010–0018289).

PY - 2018/3/25

Y1 - 2018/3/25

N2 - It was found that ultrasonic nanocrystal surface modification (UNSM) treatment performed on Ti-Nb-Ta-Zr (TNTZ) alloy surface to produce a gradient nanostructured surface layer also resulted in the nano-scale spinodal decomposition of β phase. For the first time, nano-scale spinodal decomposition of β phase induced by ultrasonic mechanical impacts was observed in a short time without any age treatment. The peak shift of XRD to lower angles, (110) β XRD peak splitting, overlapped and asymmetric XRD peaks, satellite reflections in the SAED pattern, and lattice straining in HR-TEM images confirmed nano-scale spinodal decomposition of β phase in the TNTZ alloy induced by UNSM treatment. Nano-scale EDS line-scan probe analysis revealed the β phase separation into nano-scale domains of Ti-rich (β1) and Ti-depleted (β2) phases. HR-TEM images showed the semi-coherent arrangement of Ti-rich (β1) and Ti-depleted (β2) regions. Nanosized grain formation and spinodal decomposition of β phase were induced simultaneously by UNSM treatment. The nano-scale grains, high dislocation density, and semi-coherent interface between the spinodally separated phases contributed to the high hardness of the UNSM-treated TNTZ alloy specimen.

AB - It was found that ultrasonic nanocrystal surface modification (UNSM) treatment performed on Ti-Nb-Ta-Zr (TNTZ) alloy surface to produce a gradient nanostructured surface layer also resulted in the nano-scale spinodal decomposition of β phase. For the first time, nano-scale spinodal decomposition of β phase induced by ultrasonic mechanical impacts was observed in a short time without any age treatment. The peak shift of XRD to lower angles, (110) β XRD peak splitting, overlapped and asymmetric XRD peaks, satellite reflections in the SAED pattern, and lattice straining in HR-TEM images confirmed nano-scale spinodal decomposition of β phase in the TNTZ alloy induced by UNSM treatment. Nano-scale EDS line-scan probe analysis revealed the β phase separation into nano-scale domains of Ti-rich (β1) and Ti-depleted (β2) phases. HR-TEM images showed the semi-coherent arrangement of Ti-rich (β1) and Ti-depleted (β2) regions. Nanosized grain formation and spinodal decomposition of β phase were induced simultaneously by UNSM treatment. The nano-scale grains, high dislocation density, and semi-coherent interface between the spinodally separated phases contributed to the high hardness of the UNSM-treated TNTZ alloy specimen.

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