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Title:
MAGNESIUM-BASED WROUGHT ALLOY MATERIAL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/013226
Kind Code:
A1
Abstract:
Addition of multiple solute elements can create a fracture origin through the formation of an intermetallic compound due to bonding of the added elements. It is preferable to find, while maintaining a microstructure for activating non-basal dislocation movement, additive elements that do not create a fracture origin and have the effect of promoting grain boundary sliding from among inexpensive and versatile elements. Provided is a Mg-based wrought alloy material which has excellent room-temperature ductility and contains two or more elements out of a set consisting of Mn, Zr, Bi, and Sn, the remainder of said alloy material comprising Mg and incidental impurities, and which is characterized in that: the mean grain size of the matrix thereof is 20 µm or smaller; a stress-strain curve obtained by a tension-compression test of the wrought material returns a (σmax-σbk)/ σmax value, that is, the relationship between maximum load stress (σmax) and breaking stress (σbk), of 0.2 or higher in each instance; the resistance value to fracture is 200 kJ or higher; and the grain size in Mg parent phase becomes refined during room-temperature deformation.

Inventors:
SOMEKAWA, Hidetoshi (2-1 Sengen 1-chome, Tsukuba-sh, Ibaraki 47, 〒3050047, JP)
OSAWA, Yoshiaki (2-1 Sengen 1-chome, Tsukuba-sh, Ibaraki 47, 〒3050047, JP)
Application Number:
JP2018/026096
Publication Date:
January 17, 2019
Filing Date:
July 10, 2018
Export Citation:
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Assignee:
NATIONAL INSTITUTE FOR MATERIALS SCIENCE (2-1 Sengen 1-chome, Tsukuba-shi Ibaraki, 47, 〒3050047, JP)
International Classes:
C22C23/00; C22F1/06; C22F1/00
Foreign References:
US20160168678A12016-06-16
US3063834A1962-11-13
US3071462A1963-01-01
CN102813966A2012-12-12
CN102877014A2013-01-16
Attorney, Agent or Firm:
AIKAWA, Toshihiko (Nakano Bldg. #3, 12-5 Minami Ikebukuro 2-chome, Toshima-k, Tokyo 22, 〒1710022, JP)
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