Aluminium based alloys for high temperature applications and method of producing such alloys

Patent metadata

Field	Value
Publication number	US-10273564-B2
Application number	US-201415118670-A
Country	US
Kind code	B2
Filing date	Dec 26, 2014
Priority date	Feb 14, 2014
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

The present disclosure relates to aluminum based alloys and a method for producing the aluminum based alloys. The method comprises acts of, casting of the aluminum based alloy in a chilled casting mold. Then, aging the cast aluminum based alloy at a first predetermined temperature for a first predetermined time. The aging results in the formation of a first precipitate. Followed by this, solutionizing the aluminum based alloy at a second predetermined temperature for a second predetermined time such that the major alloying element is dissolved in aluminum matrix without much affecting the first precipitate. Then, aging the aluminum based alloy at a third predetermined temperature for a third predetermined time. The aging results in the formation of a second precipitate.

First claim

We claim:

1. A method for producing an aluminium based alloy comprising:
a. casting of the aluminium based alloy in a chilled casting mould, the aluminium based alloy including a composition in weight percentage of: copper (Cu) at 4 wt % to 6.5 wt %; Zirconium (Zr) at 0.3 wt % to 0.5 wt %; and at least one transition metal selected from a group including: (a) Niobium (Nb) at 0.3 wt % to 0.5 wt %; (b) Hafnium (Hf) at 0.3 wt % to 0.6 wt %; and (c) Vanadium (V) at 0.18 wt % to 0.36 wt %; wherein the balance being aluminium (Al) and optionally along with incidental elements of the alloy;
b. aging the cast aluminium based alloy at a first predetermined temperature for a first predetermined time, wherein the aging results in the formation of first precipitate;
c. solutionising the aluminium based alloy at a second predetermined temperature for a second predetermined time; and
d. aging the aluminium based alloy at a third predetermined temperature for a third predetermined time, wherein the aging results in the formation of second precipitate;

wherein, the first predetermined temperature is higher than the third predetermined temperature.

2. The method as claimed in claim 1 optionally comprise an act of cold working of the aluminium based alloy between acts a and b.

3. The method as claimed in claim 1 comprises an act of fast cooling of the aluminium based alloy by quenching in water bath after acts b, c and d.

4. The method as claimed in claim 1 , wherein the casting mould is chilled copper mould.

5. The method as claimed in claim 1 , wherein the first predetermined temperature ranges from 350° C. to 450° C., and the first predetermined time ranges from 5 hours to 40 hours.

6. The method as claimed in claim 1 , wherein the second predetermined temperature ranges from 525° C. to 545° C., and the second predetermined time ranges from 15 minutes to 60 minutes.

7. The method as claimed in claim 1 , wherein the third predetermined temperature ranges from 150° C. to 250° C., and the third predetermined time ranges from 2 hours to 30 hours.

8. The method as claimed in claim 1 , wherein alloying elements are melted by arc melting for casting the ingot of the aluminium based alloy.

9. The method as claimed in claim 1 , wherein the incidental elements are selected from a group comprising Titanium, Chromium, Manganese, Iron, Silicon, and combination thereof.

Assignees

• Indian Inst Scient

Inventors

• Kumar M Surendra
• Mondol Sukla
• Kumar Subodh
• Suwas Satyam
• Chattopadhyay K

Classifications

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title

• B22D15/00

  Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor · CPC title

• C22C21/12

  with copper as the next major constituent · CPC title

• C22C21/14 Primary

  with silicon · CPC title

• C22F1/057

  of alloys with copper as the next major constituent · CPC title