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Toyohashi, Japan

Kawabata T.,University of Toyama | Nakagawa D.,University of Toyama | Saikawa S.,Ahresty Corporation | Nakamura J.,Tohoku University | And 2 more authors.
Materials Transactions | Year: 2013

Precipitation in Mg-Gd-Y (Gd:Y = 3: 1) alloys without Zr were investigated by HRTEM and SAED technique, and calculation of HRTEM images and electron density using DV-Xα to understand the relationship between precipitation in these alloys and HRTEM images. The diffuse scattering was obtained in as-quenched samples in each alloy by SAED and the mono-layer zones have been confirmed by HRTEM observation. The β′-phase was confirmed in the 2.9Gd0.8Y alloy by HRTEM, although the β″A-phase was confirmed in the 2.1Gd0.6Y alloy before the β′-phase. The β′-phase became predominant after prolonged aging. Zigzag lines were observed at the same time when the β′-phase appeared in the sample. HRTEM images obtained for these precipitates were compared with calculated HRTEM images. The contrast of atomic columns of the matrix in HRTEM image was calculated simplified model of cluster based on the Mg-matrix including one or some atomic columns of RE. This is also corresponded the distribution of electron density of the cluster. © 2013 The Japan Institute of Metals. Source

Tada E.,Akita University | Tada E.,Tokyo Institute of Technology | Miura Y.,Akita University | Miura Y.,Ahresty Corporation
ISIJ International | Year: 2016

In this study, hydrogen absorption behavior into Zn and Zn-55mass%Al coated steels was investigated both in an immersion test and a wet and dry cyclic corrosion test with NaCl and Na2SO4 solutions by Devanathan-Stachurski permeation technique. In the immersion test, the hydrogen absorption into Zn coated steels was observed after the surface of the steel substrate under Zn coating was exposed to corrosion environments. On the other hand, hydrogen absorption into Zn'Al coated steels was not observed for the duration of the tests because of slower dissolution kinetics of Zn'Al coating than Zn coating in the corrosion environments. In the case of a wet and dry cyclic corrosion test, hydrogen permeation current for Zn coated steel was observed during the test duration only under the condition with NaCl solution. This may be because dissolution of Zn coating takes place more locally in NaCl solution than in Na2SO4 solution. These results were discussed based on corrosion rate of the coating of Zn and Zn'Al alloy and on corrosion morphology of Zn and Zn'Al alloy coatings in NaCl and Na2SO4 solutions. © 2016 ISIJ. Source

Ahresty Corporation | Date: 2015-09-01

coolant supply machines for cooling molds for die casting and resin molding.

Ahresty Corporation | Date: 2015-12-08

Metal materials made for building or construction, namely, metal flooring and tile flooring of metal; pre-fabricated metal building assembly kits; metal joinery fittings; metal safes; metal flooring for building. Pre-fabricated non-metal building assembly kits; cement; cement mixes; cement posts; cement slabs; building timber; non-metal joinery fittings; non-metal floors for building.

Ahresty Corporation | Date: 2016-03-08

Coolant supply machines for cooling molds for die casting and resin molding.

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