Method for dissolvable aluminum alloys

Patent metadata

Field	Value
Publication number	US-2021252574-A1
Application number	US-202016789835-A
Country	US
Kind code	A1
Filing date	Feb 13, 2020
Priority date	Feb 13, 2020
Publication date	Aug 19, 2021
Grant date	—

Abstract

The method for equal channel angular extrusion increases yield strength and ultimate tensile strength of a dissolvable aluminum alloy. A billet of a dissolvable aluminum alloy is wrapped with a sheet cover so as to form a wrapped billet. The wrapped billet is extruded through an equal channel angular extrusion die with an extrusion angle ranging 90-135 degrees so as to form an extruded billet. The step of extruding is at a temperature ranging 150-250 degrees C., an extrusion rate ranging 0.003-0.010 inches per second, and a back pressure ranging 200-10000 psi. The dissolvable aluminum alloy of the extruded billet has a yield strength and ultimate tensile strength 50% greater than the initial yield strength and initial ultimate tensile strength.

First claim

We claim:

1 . A method for equal channel angular extrusion, comprising the steps of:
wrapping a billet with a sheet cover so as to form a wrapped billet, said billet being comprised of a dissolvable aluminum alloy with an initial tensile yield strength; and extruding said wrapped billet through an equal channel angular extrusion die with an extrusion angle ranging 90-135 degrees so as to form an extruded billet,
wherein the step of extruding is at a temperature ranging 150-250 degrees C.,
wherein the step of extruding is at an extrusion rate ranging 0.003-0.010 inches per second,
wherein the step of extruding is at a back pressure ranging 200-10000 psi, and
wherein said extruded billet has an extruded tensile yield strength 50% greater than said initial tensile yield strength.

2 . The method of claim 1 , wherein said temperature is 200 degrees C.

3 . The method of claim 1 , wherein said extrusion rate is 0.005 inches per second.

4 . The method of claim 1 , wherein said back pressure is 8000 psi.

5 . The method of claim 1 , wherein said sheet cover is comprised of one of a group consisting of brass and graphite.

6 . A method for equal channel angular extrusion, comprising the steps of:
wrapping a billet with a sheet cover so as to form a wrapped billet, said billet being comprised of a dissolvable aluminum alloy with an initial tensile ultimate strength; and extruding said wrapped billet through an equal channel angular extrusion die with an extrusion angle ranging 90-135 degrees so as to form an extruded billet,
wherein the step of extruding is at a temperature ranging 150-250 degrees C.,
wherein the step of extruding is at an extrusion rate ranging 0.003-0.010 inches per second,
wherein the step of extruding is at a back pressure ranging 200-10000 psi, and
wherein said extruded billet has an extruded tensile ultimate strength 50% greater than said initial tensile ultimate strength.

7 . The method of claim 6 , wherein said temperature is 200 degrees C.

8 . The method of claim 6 , wherein said extrusion rate is 0.005 inches per second.

9 . The method of claim 6 , wherein said back pressure is 8000 psi.

10 . The method of claim 6 , wherein said sheet cover is comprised of one of a group consisting of brass and graphite.

11 . A method for equal channel angular extrusion, comprising the steps of:
wrapping a billet with a sheet cover so as to form a wrapped billet, said billet being comprised of a dissolvable aluminum alloy with an initial tensile elongation; and extruding said wrapped billet through an equal channel angular extrusion die with an extrusion angle ranging 90-135 degrees so as to form an extruded billet,
wherein the step of extruding is at a temperature ranging 150-250 degrees C.,
wherein the step of extruding is at an extrusion rate ranging 0.003-0.010 inches per second,
wherein the step of extruding is at a back pressure ranging 200-10000 psi, and
wherein said extruded billet has an extruded tensile elongation 50% greater than said initial tensile elongation.

12 . The method of claim 11 , wherein said temperature is 200 degrees C.

13 . The method of claim 11 , wherein said extrusion rate is 0.005 inches per second.

14 . The method of claim 11 , wherein said back pressure is 8000 psi.

15 . The method of claim 11 , wherein said sheet cover is comprised of one of group consisting of brass and graphite.

Assignees

• Cnpc Usa Corp
• Beijing Huamei Inc

Inventors

• Xu Jianhui
• Dunne Timothy
• Sang Yu
• Song Yi
• Yue Wenhan
• Liu Yu
• Yang Xiongwen

Classifications

• B21C31/00

  Control devices for metal extruding, e.g. for regulating the pressing speed or temperature of metal (B21C25/08 takes precedence); Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses · CPC title

• B21C25/02

  Dies · CPC title

• B21C23/21

  Presses specially adapted for extruding metal · CPC title

• B21C23/002 Primary

  Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences · CPC title

• C22F1/04

  of aluminium or alloys based thereon · CPC title