Achieving Superplasticity of Ultrafine-Grained Rod-Like AZ61 Alloy Using High-Pressure Sliding

Masuda, Takahiro; Fujimitsu, Kazushige; Takizawa, Yukio; Horita, Zenji

doi:10.2320/jinstmet.j2015046

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…The intense shear strain introduced in the samples results in ultra ne grains. One advantage of the HPS process is that it can be applied to samples with practical shapes such as sheets and rods; so far, it has been applied to sheets of pure Al (99.99%), Al-Mg alloy, AZ61 Mg alloy, and 7000 series Al alloy [18][19][20] , as well as rods of pure Al (99.99%), Al-Mg alloy, AZ61 Mg alloy, 2000 series Al alloy, and 7000 series Al alloy [21][22][23] . The ca-pacity of the HPS machine was recently increased to 500 tons 24,25) , which allows the samples to be scaled up 24,25) .…”

Section: Introductionmentioning

confidence: 99%

Extra Strengthening and Superplasticity of Ultrafine-Grained A2024 Alloy Produced by High-Pressure Sliding

Masuda

Takizawa

Yumoto³

et al. 2017

Mater. Trans.

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In this study, the method of high-pressure sliding (HPS) was applied for grain re nement of an A2024 alloy. Sheet samples with 10-15 mm width and 100 mm length with 1 mm thickness were processed by HPS under pressures of 2-3 GPa. Microstructural observations revealed that the grain size was re ned to 200 nm. Tensile tests showed that the ultimate tensile strength reached 886 MPa with a total elongation of 7.1% and the anisotropy of samples was less developed in the HPS-processed samples. Extra strengthening was attained by aging at 423 K after HPS processing, leading to an ultimate tensile strength of 967 MPa at the peak aged condition. Superplastic elongation of more than 400% appeared when the A2024 alloy processed by HPS for 20 mm was deformed in tension at a testing temperature of 623 K with an initial strain rate of 1.0 × 10 −3 s −1 .

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Section: Introductionmentioning

confidence: 99%

Extra Strengthening and Superplasticity of Ultrafine-Grained A2024 Alloy Produced by High-Pressure Sliding

Masuda

Takizawa

Yumoto³

et al. 2017

Mater. Trans.

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“…(HPS: High-Pressure Sliding) 加工 55) と呼ばれ，粉末の固化 60) をはじめ，多くの金属材料 [56][57][58][59] に利用されている．この HPS プロセスは棒状試料 [61][62][63][64] やパイプ状試料 65) にも適用可能であることが示されている．さらに，試料の逐次送りと組み合わ V i e w せることで，SPD 処理面積が拡大できることも示されている 66,67) ．このような開発は，SPD プロセスの実用化を目指したもので，最近のレビュー論文 68) でも詳しく解説されている．本研究では，HPS プロセス装置はむしろ小型にして，シンクロトロン光施設における高圧高温下でのその場 X 線解析に使用する． HPT や HPS プロセスによる特性向上は，プロセス中に発生する高密度の格子欠陥に起因している [69][70][71] ．このような格 [72][73][74] やマルチアンビル装置 75,76) を用いて行われることが多い．これらは主に静水圧条件下で使用されるが， DAC の場合，Bridgman のアイデアに沿って，一方のダイヤモンドアンビルを他方に対して回転させることで意図的に塑性変形を導入できる 13) ．Blank らは DAC を用いてせん断ひずみを導入した最初であり 77,78) ，Levitas らは DAC でひずみ導 A d v a n c e…”

Section: はじめにunclassified

高圧スライド法を用いたTi同素変態のその場放射光X線解析

Horita

Maruno

Ikeda

et al. 2023

J. Japan Inst. Metals and Materials

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In this study, severe plastic deformation through high-pressure sliding (HPS) was applied for in situ high-energy X-ray diffraction analysis at SPring-8 in JASRI (Japan Synchrotron Radiation Research Institute). Allotropic transformation of pure Ti was examined in terms of temperatures, pressures and imposed strain using a miniaturized HPS facility. The true pressure applied on the sample was estimated from the peak shift. Peak broadening due to local variation of pressure was reduced using white X-ray. The phase transformation from α phase to ω phase occurred at a pressure of ∼4.5 GPa. Straining by the HPS processing was effective to promote the transformation to the ω phase and to maintain the ω phase even at ambient pressure. The reverse transformation from ω phase to α phase occurred at a temperature of ∼110℃ under ambient pressure, while under higher pressure as ∼4 GPa, the ω phase remained stable even at ∼170℃ covered in this study. It was suggested that the reverse transformation from the ω phase to the α phase is controlled by thermal energy.

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“…The performance and applicability of such SPD processes are enhanced by modification: among them are continuous ECAP [10,11], ECAP with parallel channels (ECAP-PC) [12], ECAP for drawing [13] and ECAP for plate [14], continuous HPT [15,16], incremental feeding HPT [17] and bulk HPT [18]. Recently, the process of high-pressure sliding (HPS) was developed so that it is applicable for grain refinement of samples in forms of sheet [19][20][21][22][23][24] and rod [25][26][27][28]. It was also demonstrated that the sample dimensions can be scaled up by combining an incremental technique with the HPS processing, named incremental feeding HPS (IF-HPS) [29,30] for sheets and by introducing multi-pass technique, named multi-pass HPS (MP-HPS) [28] for rods.…”

Section: Introductionmentioning

confidence: 99%

Grain refinement and superplasticity of pipes processed by high-pressure sliding

Tang

Matsuda

Takizawa³

et al. 2020

Materials Science and Technology

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The high-pressure sliding (HPS) process was applied for grain refinement of a pipe form of an Al-3wt%Mg-0.2wt%Sc alloy by developing two types of straining techniques (called in this study anvil sliding and mandrel sliding). To achieve a homogeneous microstructure throughout the cross-section of the pipe, the sample is rotated around the longitudinal axis every after sliding operation by introducing multi-pass technique, named multi-pass HPS (MP-HPS) as developed earlier for rods. The MP-HPS-processed sample shows ultrafine-grained structures with an average grain size of ∼260 and ∼300 nm after the HPS processing using anvil sliding and mandrel sliding. The samples also exhibit superplasticity with total elongations well more than 400%, respectively. A finite-element method is used to simulate the evolution of strain in the HPS processing and demonstrates that the simulation well represents the experimental results.

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Achieving Superplasticity of Ultrafine-Grained Rod-Like AZ61 Alloy Using High-Pressure Sliding

Abstract: Fig. 1 Schematic illustration of High Pressure Sliding (HPS). (a) Cross sectional view and (b) 3 dimensional views.

Cited by 10 publications

References 27 publications

Extra Strengthening and Superplasticity of Ultrafine-Grained A2024 Alloy Produced by High-Pressure Sliding

Extra Strengthening and Superplasticity of Ultrafine-Grained A2024 Alloy Produced by High-Pressure Sliding

高圧スライド法を用いたTi同素変態のその場放射光X線解析

Grain refinement and superplasticity of pipes processed by high-pressure sliding

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