Effects of Constraint and Strain Path on Evolution of Ultrafine Grained Microstructure by Multi-Axial Alternative Forging

Masafumi Noda; Kunio Funami; Yutaka  Suwahara

doi:10.4028/www.scientific.net/MSF.475-479.3471

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Grain Growth and Mechanical Properties of Nanograined Bulk Fe-25Ni Alloy
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Nucleation Barrier for the Precipitation in Nanosized Al-4wt%Cu Alloy
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Formation of Fe₈₆Zr_5.5Nb_5.5B₃ Nanocrystalline Bulk Alloy under High Pressure
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Effects of Constraint and Strain Path on Evolution of Ultrafine Grained Microstructure by Multi-Axial Alternative Forging
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Textures and Grain Growth in Nanocrystalline Fe-Ni Alloys
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HomeMaterials Science ForumMaterials Science Forum Vols. 475-479Effects of Constraint and Strain Path on Evolution...

Effects of Constraint and Strain Path on Evolution of Ultrafine Grained Microstructure by Multi-Axial Alternative Forging

Abstract:

For the formation of ultrafine grain in Al alloys, various means have been investigated based on a process of continuous recrystallization using a high-strain technique that employs rigorous plastic working. However, utilization for practical application is difficult for small specimens that require constraining. In this study, the effects were studied of the use of constraining die walls in the multi-axial alternative forging process (MAF) on the formation of ultrafine grains and microstructural homogeneity. This technique has possible for scaling up to a practical scale. Our results showed that tensile strength and yield stress in these fabricated materials were tripled over those of the initial materials when strain was applied. The average grain size after strain application was 0.5 µm. We conclude that a loading technique that uses different applied directions is the key determinant in creating ultrafine grains.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

3471-3474

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.3471

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Online since:

January 2005

Authors:

Masafumi Noda, Kunio Funami, Yutaka Suwahara

Keywords:

Aluminium Alloy, Mechanical Property, Multi-Axial Alternative Forging, Residual Stress, Strain Path, Texture, Ultrafine Grained

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References

[1] Z. Horita, M. Furukawa, M. Nemoto and T. G. Langdon: Materials Science and Technology, 16 (2000), 1239-1245.

Google Scholar

[2] N. Tsuji, T. Murakami and Y. Saito: J. JIM, 63 (1999), 243-251.

Google Scholar

[3] M. Noda, M. Hirohashi, K. Funami and Y. Suwahara: J. JIM, 66 (2002) 101-108.

Google Scholar

[4] M. Noda, M. Hirohashi and K. Funami: Mater. Trans., 44 (2003) 2288-2297.

Google Scholar

[5] R. Kaibyshev, T. Sakai, F. Musin, I. Nikulin and H. Miura: Scripta Mater., 45 (2001) 1373-1380. Fig. 5 Change of residual stress with the increase in equivalent strain. Fig. 5 Change of residual stress with the increase in equivalent strain.

DOI: 10.1016/s1359-6462(01)01172-1

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