公开(公告)号：US20190078186A1

公开(公告)日：2019-03-14

申请号：US16082562

申请日：2017-03-08

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Hidetoshi SOMEKAWA ,  Alok SHINGH ,  Tadanobu INOUE

IPC: C22F1/06 ,  C22C23/00

Abstract: In order to improve the ductility or formability of a magnesium alloy, addition of rare earth elements or refinement of grain size is often used. However, conventional additional elements inhibit the action of grain boundary sliding for complementing plastic deformation. Therefore, it is required to search for additional elements that act to facilitate the grain boundary sliding not only at a conventional deformation speed but also in a higher speed range while maintaining a microstructure for activating non-basal dislocation. The present invention is to provide a wrought processed Mg-based alloy having excellent ductility at room temperature, which consists of 0.25 mass % or more to 9 mass % or less of Bi, and a balance of Mg and inevitable components, and is characterized by having an average grain size of an Mg parent phase after solution treatment and hot plastic working after casting of 20 μm or less.

公开(公告)号：US20130129908A1

公开(公告)日：2013-05-23

申请号：US13709519

申请日：2012-12-10

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Sachiko HIROMOTO ,  Akiko YAMAMOTO ,  Norio MARUYAMA ,  Toshiji MUKAI ,  Hidetoshi SOMEKAWA

IPC: A61L27/00

CPC classification number: A61L27/00 ,  A61L27/047 ,  A61L27/32 ,  A61L27/58 ,  C23C22/22

Abstract: A magnesium-based medical device which can adjust a degree of corrosion within a wide range of period such that the device can maintain a sufficient strength only during a desired period and disappears within a desired period thereafter and a manufacturing method thereof are provided. A magnesium-based medical device of the present invention is a magnesium-based medical device in which a base material is made of magnesium or a magnesium alloy, wherein a corrosion-resistant film is formed on a surface of the base material, and variation in surface hardness of the formed corrosion-resistant film in the in-plane direction is less than 21 in terms of a dispersion value of Vickers hardness.