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論文

Analysis and mapping of detailed inner information of crystalline grain by wavelength-resolved neutron transmission imaging with individual Bragg-dip profile-fitting analysis

櫻井 洋亮*; 佐藤 博隆*; 足立 望*; 諸岡 聡; 戸高 義一*; 加美山 隆*

Applied Sciences (Internet), 11(11), p.5219_1 - 5219_17, 2021/06

 被引用回数:1 パーセンタイル:76.99(Chemistry, Multidisciplinary)

As a new method for evaluating single crystal and oligocrystal, pulsed neutron Bragg-dip transmission analysis/imaging method is being developed. In this study, a single Bragg-dip profile fitting analysis method was newly developed, and applied for analyzing detailed inner information in a crystalline grain position-dependently. In the method, the spectrum profile of a single Bragg-dip is analyzed at each position over a grain. As a result, it is expected that changes of crystal orientation, mosaic spread angle and thickness of a perfect crystal can be evaluated from the wavelength, the width and the integrated intensity of the Bragg-dip, respectively. For confirming this effectiveness, the method was applied to experimental data of position-dependent Bragg-dip transmission spectra of a Si-steel plate consisting of oligocrystals. As a result, inner information of multiple crystalline grains could be visualized and evaluated. The small change of crystal orientation in a grain, about 0.4$$^{circ}$$, could be observed by imaging the Bragg-dip wavelengths. By imaging the Bragg-dip widths, both another grain and mosaic block in a grain were detected. Furthermore, imaging results of the integrated intensities of Bragg-dips were consistent with the results of Bragg-dip width imaging. These small crystallographic changes have not been observed and visualized by previous Bragg-dip analysis methods.

論文

中性子回折ラインプロファイル解析によるフェライト系およびオーステナイト系ステンレス鋼の引張変形中の転位増殖その場観察

佐藤 成男*; 黒田 あす美*; 佐藤 こずえ*; 熊谷 正芳*; Harjo, S.; 友田 陽*; 齋藤 洋一*; 轟 秀和*; 小貫 祐介*; 鈴木 茂*

鉄と鋼, 104(4), p.201 - 207, 2018/00

 被引用回数:5 パーセンタイル:43.06(Metallurgy & Metallurgical Engineering)

To investigate the characteristics of dislocation evolution in ferritic and austenitic stainless steels under tensile deformation, neutron diffraction line-profile analysis was carried out. The austenitic steel exhibited higher work hardening than the ferritic steel. The difference in the work hardening ability between the two steels was explained with the dislocation density estimated by the line-profile analysis. The higher dislocation density of the austenitic steel would originate from its lower stacking fault energy. Dislocation arrangement parameters indicated that the strength of interaction between dislocations in the austenitic steel was stronger than that in the ferritic steel.

論文

Composite behavior of lath martensite steels induced by plastic strain, a new paradigm for the elastic-plastic response of martensitic steels

Ung$'a$r, T.*; Harjo, S.; 川崎 卓郎; 友田 陽*; Rib$'a$rik, G.*; Shi, Z.*

Metallurgical and Materials Transactions A, 48(1), p.159 - 167, 2017/01

AA2016-0372.pdf:2.81MB

 被引用回数:25 パーセンタイル:86.24(Materials Science, Multidisciplinary)

Based on high-resolution neutron diffraction experiments we will show that in lath martensite steels the initially homogeneous dislocation structure is disrupted by plastic deformation, to produce a composite on the length scale of martensite lath packets. The diffraction patterns of plastically strained martensitic steel reveal characteristically asymmetric peak profiles in the same way as has been observed in materials with heterogeneous dislocation structures. Lath packets oriented favorably or unfavorably for dislocation glide become soft or hard. The lath packet type develops by work softening or work hardening in which the dislocation density becomes smaller or larger compared to the initial average one. The decomposition into soft and hard lath packets is accompanied by load redistribution between the two lath packet types. The composite behavior of plastically deformed lath martensite opens a new way to understand the elastic-plastic response in this class of materials.

論文

Analysis of the asymmetric 002 X-ray line profiles of $$gamma$$-irradiated polyethylene

依田 修; 小田島 晟*

Japanese Journal of Applied Physics, 19(7), p.1241 - 1245, 1980/00

 被引用回数:11 パーセンタイル:51.26(Physics, Applied)

非対称X線回折線プロフィルの解析を行い、非対称性は、プロフィルの反射次数が低く、格子歪がプロフィルの幅を広げる効果があまり顕著でない場合には、微結晶のサイズと格子面間隔の間に一定の相関があるために現れることを見出した。$$gamma$$線を大量に照射したポリエチレンの002プロフィルに応用し、サイズと両間隔の相関を明らかにして、$$gamma$$線によるポリエチレン結晶の崩壊機構を明らかにした。

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