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1. WO2009014807 - FORMING MAGNESIUM ALLOYS WITH IMPROVED DUCTILITY

Publication Number WO/2009/014807
Publication Date 29.01.2009
International Application No. PCT/US2008/065252
International Filing Date 30.05.2008
IPC
C22C 23/00 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
23Alloys based on magnesium
C22C 23/06 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
23Alloys based on magnesium
06with a rare earth metal as the next major constituent
B21C 23/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
23Extruding metal; Impact extrusion
CPC
B21C 23/002
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
23Extruding metal; Impact extrusion
002Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
B21C 29/00
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
29Cooling or heating work or parts of the extrusion press; ; Gas treatment of work
C22C 1/002
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
1Making alloys
002Making amorphous alloys
C22C 23/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
23Alloys based on magnesium
C22C 23/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
23Alloys based on magnesium
06with a rare earth metal as the next major constituent
C22F 1/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
1Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
06of magnesium or alloys based thereon
Applicants
  • GM GLOBAL TECHNOLOGY OPERATIONS, INC. [US]/[US] (AllExceptUS)
Inventors
  • GUPTA, Anil, K.
  • KUMAR, Arun, M.
  • RAMARAO, Palle
  • SACHDEV, Anil, K.
  • LUO, Aihua, A.
  • MISHRA, Raja, K.
Agents
  • CARD, John, M.
Priority Data
60/952,01826.07.2007US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FORMING MAGNESIUM ALLOYS WITH IMPROVED DUCTILITY
(FR) FORMATION D'ALLIAGES DE MAGNÉSIUM AYANT UNE DUCTILITÉ AMÉLIORÉE
Abstract
(EN)
A magnesium alloy comprising up to about one weight percent of cerium may be hot worked to produce an intermediate or final alloy workpiec that exhibits enhanced ductility at room temperature. The addition of a small amount of cerium may affect the magnesium alloy by reducing yield strength, refining grain size, and improving the work hardening behavior. Recrystallization during hot deformation of the rare earth containing magnesium material alters the texture of the alloy and orients the grains in a manner that favors basal slip activity. The alloy thus deforms at room temperature by a combination of twinning and slip mechanisms.
(FR)
Un alliage de magnésium comprenant jusqu'à environ un pour cent en poids de cérium peut être travaillé à chaud pour produire une pièce à travailler en alliage intermédiaire ou final qui présente une ductilité améliorée à la température ambiante. L'addition d'une petite quantité de cérium peut affecter l'alliage de magnésium par réduction de la résistance à la déformation, affinage de la dimension du grain et amélioration du comportement de durcissement d'écoulement. Une recristallisation pendant une déformation à chaud de la matière de magnésium contenant un métal des terres rares modifie la texture de l'alliage et oriente les grains d'une manière qui favorise une activité de glissement basal. L'alliage se déforme ainsi à la température ambiante par une combinaison de mécanismes d'hémitropie et de glissement.
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