公开(公告)号：US11692256B2

公开(公告)日：2023-07-04

申请号：US16629906

申请日：2018-07-10

Applicant: National Institute for Materials Science

Inventor： Hidetoshi Somekawa ,  Yoshiaki Osawa

IPC: C22F1/06 ,  C22C23/00

CPC classification number: C22F1/06 ,  C22C23/00

Abstract: Adding multiple solute elements could create fracture origin through formation of intermetallic compound due to bonding of added elements. While maintaining microstructure for activating non-basal dislocation movement, additive elements not to create fracture origin, but to promote grain boundary sliding are preferably found from among inexpensive and versatile elements. Provided is Mg-based wrought alloy material including two or more among group consisting of Mn, Zr, Bi, and Sn; and Mg and unavoidable constituents, having excellent room-temperature ductility and characterized by having finer crystal grain size in Mg parent phase during room-temperature deformation and in that mean grain size in matrix thereof is 20 μm or smaller; rate of (σmax−σbk)/σmax (maximum load stress (σmax), breaking stress (σbk)) in stress-strain curve obtained by tension-compression test of the wrought material is 0.2 or higher; and resistance against breakage shows 200 kJ or higher.

公开(公告)号：US20210079508A1

公开(公告)日：2021-03-18

申请号：US16629906

申请日：2018-07-10

Applicant: National Institute for Materials Science

Inventor： Hidetoshi Somekawa ,  Yoshiaki Osawa

IPC: C22F1/06 ,  C22C23/00

Abstract: Adding multiple solute elements could create fracture origin through formation of intermetallic compound due to bonding of added elements. While maintaining microstructure for activating non-basal dislocation movement, additive elements not to create fracture origin, but to promote grain boundary sliding are preferably found from among inexpensive and versatile elements. Provided is Mg-based wrought alloy material including two or more among group consisting of Mn, Zr, Bi, and Sn; and Mg and unavoidable constituents, having excellent room-temperature ductility and characterized by having finer crystal grain size in Mg parent phase during room-temperature deformation and in that mean grain size in matrix thereof is 20 μm or smaller; rate of (σmax−σbk)/σmax (maximum load stress (σmax), breaking stress (σbk)) in stress-strain curve obtained by tension-compression test of the wrought material is 0.2 or higher; and resistance against breakage shows 200 kJ or higher.

公开(公告)号：US11578396B2

公开(公告)日：2023-02-14

申请号：US16632314

申请日：2018-07-13

Applicant: National Institute for Materials Science

Inventor： Hidetoshi Somekawa ,  Yoshiaki Osawa

IPC: C22F1/06 ,  C22C23/00

Abstract: Provided is Mg-based alloy wrought material having improved ductility, formality, and resistance against fracture. Intermetallic compounds may be formed by mutual bonding of added elements to be a fracture origin. While maintaining microstructure for activating non-basal dislocation movement of Mg-based alloy wrought material, added elements to create no fracture origin, but to promote grain boundary sliding were found from among inexpensive and versatile elements. Provided is Mg-based alloy wrought material including at least one element from Zr, Bi, and Sn and at least one element from Al, Zn, Ca, Li, Y, and Gd wherein remainder comprises Mg and unavoidable impurities; an average grain size in a parent phase is 20 μm or smaller; a value of (σmax−σbk)/σmax (maximum load stress (σmax), breaking stress (σbk)) in a stress-strain curve obtained by tension-compression tests of the wrought material is 0.2 or higher; and resistance against breakage shows 100 kJ or higher.

公开(公告)号：US20200173002A1

公开(公告)日：2020-06-04

申请号：US16632314

申请日：2018-07-13

Applicant: National Institute for Materials Science

Inventor： Hidetoshi Somekawa ,  Yoshiaki Osawa

IPC: C22F1/06 ,  C22C23/00

Abstract: Provided is Mg-based alloy wrought material having improved ductility, formality, and resistance against fracture. Intermetallic compounds may be formed by mutual bonding of added elements to be a fracture origin. While maintaining microstructure for activating non-basal dislocation movement of Mg-based alloy wrought material, added elements to create no fracture origin, but to promote grain boundary sliding were found from among inexpensive and versatile elements. Provided is Mg-based alloy wrought material including at least one element from Zr, Bi, and Sn and at least one element from Al, Zn, Ca, Li, Y, and Gd wherein remainder comprises Mg and unavoidable impurities; an average grain size in a parent phase is 20 μm or smaller; a value of (σmax−σbk)/σmax (maximum load stress (σmax), breaking stress (σbk)) in a stress-strain curve obtained by tension-compression tests of the wrought material is 0.2 or higher; and resistance against breakage shows 100 kJ or higher.

公开(公告)号：US20150083285A1

公开(公告)日：2015-03-26

申请号：US14390833

申请日：2013-05-28

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Hidetoshi Somekawa ,  Yoshiaki Osawa ,  Toshiji Mukai ,  Alok Singh ,  Kota Washio ,  Akira Kato

IPC: C22C23/00 ,  C22C23/06 ,  C22F1/06

CPC classification number: C22C23/00 ,  C22C1/02 ,  C22C23/06 ,  C22F1/00 ,  C22F1/06

Abstract: A magnesium alloy of the present invention has the chemical composition that contains 0.02 mol % or more and less than 0.1 mol % of at least one element selected from yttrium, scandium, and lanthanoid rare earth elements, and magnesium and unavoidable impurities accounting for the remainder. A magnesium alloy member of the present invention is produced by hot plastic working of the magnesium alloy in a temperature range of 200° C. to 550° C., followed by an isothermal heat treatment performed in a temperature range of 300° C. to 600° C. The magnesium alloy is preferred for use in applications such as in automobiles, railcars, and aerospace flying objects. The magnesium alloy and the magnesium alloy member can overcome the yielding stress anisotropy problem, and are less vulnerable to the rising price of rare earth elements.

Abstract translation: 本发明的镁合金的化学成分含有选自钇，钪和镧系稀土元素中的至少一种以上的元素的0.02摩尔％以上且小于0.1摩尔％，剩余的镁和不可避免的杂质 。 本发明的镁合金构件通过在200℃〜550℃的温度范围内对镁合金进行热塑性加工而制成，然后在300℃〜300℃的温度范围内进行等温热处理， 600℃。镁合金优选用于诸如汽车，轨道车辆和航空航天飞行物体的应用中。 镁合金和镁合金构件可以克服屈服应力各向异性问题，并且不太容易受到稀土元素价格上涨的影响。