Faculty Profiles - HASEGAWA, Masashi

Papers - HASEGAWA, Masashi

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Electronic Structure of Pd- and Zr-based Bulk Metallic Glasses Studied by Use of Hard X-ray Photoelectron Spectroscopy Reviewed

K. Soda, S. Ota, T. Suzuki, H. Miyazaki, M. Inukai, M. Kato, S. Yagi, T. Takeuchi, M. Hasegawa, H. Sato and U. Mizutani

AIP Conf. Proc. Vol. 879 page： 1821-1824 2007

New La nitrides in high pressure and temperature Reviewed

M. Hasegawa, K. Niwa and T. Yagi

Solid State Commun. Vol. 141 page： 267-272 2007

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We succeeded in synthesizing two new lanthanum nitrides in a supercritical nitrogen fluid at high pressure (about 30 GPa) and high temperature (about 2000 K), using a diamond anvil cell and a YAG laser heating system. These nitrides were found to be stable down to 5 GPa and similar to 300 K in a nitrogen atmosphere. One of the new lanthanum nitrides is a cubic P lattice-type phase, which is a main phase synthesized nitride. The calculated lattice parameter is a = 11.979 angstrom at 5 GPa, 300 K. The other nitride is of a trigonal P lattice-type. The calculated lattice parameters are a = 3.889 angstrom and c = 6.691 angstrom at 5 GPa, 300 K. The most likely phase of the former new La nitride is Pa (3) over bar La2N3+delta, the structure of which may be similar to the Ia (3) over bar Mn2O3-type (Ia80). The phase of the latter nitride is P (3) over bar ml La2N3+delta, the structure of which is the same as the P (3) over bar ml La2O3-type (hP5).

Stability and electronic structure of Zr-based ternary metallic glasses and relevant compounds Reviewed

M. Hasegawa, K. Soda, H. Sato, T. Taketomi, T. Takeuchi, H. Kato and U. Mizutani

J. Alloys and Compd. Vol. 434 page： 149-151 2007

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

The electronic structure of the Zr-based metallic glasses has been investigated by theoretical and experimental approaches. One approach is band calculations of the Zr2Ni (Zr66.7Ni33.3) compound to investigate the electronic structure of the Zr66.7Ni33.3 metallic glass (Delta T-x = 0 K) of which the local atomic structure is similar to that of the Zr2Ni compound. The other is photoemission spectroscopy of the Zr50Cu35Al15 bulk metallic glass (BMG) (Delta T-x = 69 K). Here Delta T-x = T-x - T-x where T-x and T-g are crystallization and glass transition temperature, respectively. Both results and previous ones on the Zr55Cu30Ni5Al10 BMG indicate that there is a pseudogap at the Fermi level in the electronic structure of these Zr-based metallic glasses, independent of the value of the Delta T-x. This implies that the pseudogap at the Fermi level is one of the factors that stabilize the glass phase of Zr-based metallic glasses.

Internal friction induced by interstitial atoms in multicomponent glassy alloy and composite Invited Reviewed

M. Hasegawa, M. Takeuchi, D. Nagata, T. Wada, H. Kato, Y. Yamaura and A. Inoue

J. Alloys and Compd. Vol. 434 page： 196-198 2007

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Effects of the 2 at% addition on the stability and hydrogen-induced internal friction behavior of the Ti34Zr11Cu47Ni8 multicomponent glassy alloy have been investigated. Thermal analysis indicates that the supercooled liquid region decreases by adding Nb, indicating that 2 at % Nb addition reduces glass forming ability. On the other hand, there is no effect of the Nb addition on the hydrogen content dependence of the peak internal friction and the peak temperature. Nb has no attractive interaction with Ti and Zr but is attracted to Ni atoms. The contrasting effects of Nb addition are thus attributable to its alternative effects on the local atomic structure, i.e. no effect of Nb on the local atomic structure around Ti and Zr having high affinity with hydrogen but strong effect on the environment of Ni.

Electronic structure and phase stability of glassy alloys Invited Reviewed

M. Hasegawa, T. Takeuchi, K. Soda, H. Sato and U. Mizutani

Mater. Sci. Forum Vol. 539-543 page： 2048-2053 2007

Local atomic arrangements and electronic structure of the Zr-Ni-Al bulk metallic glass. “Analysis by use of the relevant crystals" Reviewed

T. Takeuchi, S. Nakano, M. Hasegawa, K. Soda, H. Sato, U. Mizutani, K. Itoh and T. Fukunaga

Mater. Sci. Eng. A Vol. 449 page： 599-604 2007

Analysis of bulk metallic glass formation using a tetrahedron composition diagram that consists of constituent classes based on blocks of elements in the periodic table Reviewed

A. Takeuchi, S. Ranganathan, M. Hasegawa, B.S. Murty and A Inoue

Mater. Trans. Vol. 48 page： 1304-1312 2007

Electronic structure and stability of the Pd-Ni-P bulk metallic glass Reviewed

T. Takeuchi, D. Fukamaki, H. Miyazaki, K. Soda, M. Hasegawa, H. Sato, U. Mizutani, T. Ito, S. Kimura

Mater. Trans. Vol. 48 page： 1292-1298 2007

Mechanical properties and microstructures of composites of Ti-based metallic glass and beta-Ti Reviewed

T. Yamamoto, H. Ito, M. Hasegawa and A. Inoue

Mater. Trans. Vol. 48 page： 1812-1815 2007

Effect of nanocrystal distribution on mechanical properties of ti-based metallic glasses Reviewed

H. Ito, T. Yamamoto, M. Hasegawa and A. Inoue

Mater. Trans. Vol. 48 page： 1755-1758 2007

Pd基金属ガラスの電子構造と相安定性 Reviewed

深牧大介，竹内恒博，曽田一雄，長谷川正，水谷宇一郎，佐藤洋一

粉体および粉末冶金 Vol. 54 page： 754-760 2007

Voronoi analysis of the structure of Ni-Zr-Al ternary metallic glass Reviewed

T. Fukunaga, K. Itoh, T. Otomo, K. Mori, M. Sugiyama, H. Kato, M. Hasegawa, A. Hirata, Y. Hirotsu and A. C. Hannon

Materials Transactions Vol. 48 page： 1698-1702 2007

Preparation and mechanical properties of dispersed-ZrN glassy composite alloys containing pores Reviewed

M. Hasegawa, D. Nagata, T. Wada and A. Inoue

Acta Materialia Vol. 54 page： 3221-3226 2006

Hydrogen-induced internal friction of Ti-rich multicomponent glassy alloys Reviewed

M. Hasegawa, M. Takeuchi, H. Kato, S. Yamaura and A. Inoue

Mater. Sci. Eng. A Vol. 442 page： 106-108 2006

Structure of Cu-Zr and Ni-Zr metallic glasses and RMC modeling Reviewed

T. Fukunaga, K. Itoh, T. Otomo, K. Mori, M. Sugiyama, H. Kato, M. Hasegawa, A. Hirata and Y. Hirotsu

Intermetallics Vol. 14 page： 893-897 2006

Fragility and thermal stability of Pt- and Pd- based bulk glass forming liquids and their correlation with deformability Reviewed

H. Kato, T. Wada, M. Hasegawa, A. Inoue, J. Saida and H. S. Chen

Scripta Materialia Vol. 54 page： 2023-2027 2006

Voronoi analysis of the structure of Cu-Zr and Ni-Zr metallic glasses Reviewed

T. Fukunaga, K. Itoh, T. Otomo, K. Mori, M. Sugiyama, H. Kato, M. Hasegawa, A. Hirata, Y. Hirotsu and A. C. Hannon

Intermetallics Vol. 14 page： 893–897 2006

Internal friction and mechanical strength of hydrogenated Ti-rich multicomponent glassy alloys Reviewed

M. Hasegawa, M. Takeuchi, D. Nagata, T. Wada, H. Kato, Y. Yamaura and A. Inoue

Key Engineering Materials Vol. 3196 page： 139-144 2006

Topological characterization of metallic glasses by neutron diffraction and RMC modeling Reviewed

Toshiharu Fukunaga, Keiji Itoh, Toshiya Otomo, Kazuhiro Mori, Masaaki Sugiyama, Hidemi Kato, Masashi Hasegawa, Akihiko Hirata, Yoshihiko Hirotsu, Kiyoshi Aoki

Physica B Vol. 385–386 page： 259–262 2006

関連結晶相の局所構造解析を利用したZr-Ni-Alバルクアモルファス相の安定性の解明 Reviewed

中野さくら, 竹内恒博, 曽田一雄, 長谷川正, 水谷宇一郎, 佐藤洋一，伊藤恵司，福永俊晴

粉体及び粉末冶金 Vol. 53 page： 100-106 2006

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