Aluminum alloy for engine piston of automobile and method for producing the same

Patent metadata

Field	Value
Publication number	US-2016138137-A1
Application number	US-201514708156-A
Country	US
Kind code	A1
Filing date	May 8, 2015
Priority date	Nov 19, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

An aluminum alloy for an engine piston of an automobile may be composed of Ti, B, Cu and the balance of Al and may include a TiB 2 phase as a reinforcing phase. A composition weight ratio of Ti:B:Cu is 0.5 to 2.5:1:1 to 1.3. The aluminum alloy may have excellent elasticity, thermal properties, and formability by maximizing a generation of a TiB 2 reinforcing phase.

First claim

What is claimed is:

1 . An aluminum alloy for an engine piston of an automobile, comprising Ti, B, Cu and a balance of Al and including a TiB 2 phase as a reinforcing phase, wherein a composition weight ratio of Ti:B:Cu is 0.5 to 2.5:1:1 to 1.3.

2 . The aluminum alloy of claim 1 , further comprising Si,
wherein Si is 11 to 14 wt % of the aluminum alloy, Ti is less than 2.5 wt % (except for 0) of the aluminum alloy, B is less than 1.5 wt % (except for 0) of the aluminum alloy, and Cu is 0.5 to 1.5 wt % of the aluminum alloy.

3 . The aluminum alloy of claim 1 , further comprising Mn,
wherein Mn is 1 to 1.5 wt % of the aluminum alloy, Ti is less than 2.5 wt % (except for 0) of the aluminum alloy, B is less than 1.5 wt % (except for 0) of the aluminum alloy, and Cu is 0.5 to 1.5 wt % of the aluminum alloy.

4 . A method for producing an aluminum alloy, comprising steps of:
charging Al—Ti master alloy, Al—B master alloy or 75 wt % of Al salt compound in Al molten metal which is received in a melting furnace, in which Ti is less than 2.5 wt % (except for 0) of the aluminum alloy, B is less than 1.5 wt % (except for 0) of the aluminum alloy, Cu is 0.5 to 1.5 wt % of the aluminum alloy, and the composition weight ratio of Ti:B:Cu is set to satisfy 0.5 to 2.5:1:1 to 1.3; and agitating the molten metal using an agitator so as to generate and disperse a TiB 2 phase which is a reinforcing phase by a spontaneous reaction.

5 . The method of claim 4 , wherein a length of the agitator is set to be 0.4 times or more than a diameter of the melting furnace, and
in the step of agitating, the molten metal is agitated at a speed of 500 rpm or more.

6 . The method of claim 4 , wherein the Al—Ti master alloy is composed of Ti: 5 to 20 wt % and a balance of Al.

7 . The method of claim 4 , wherein the Al—B master alloy is composed of B: 3 to 10 wt % and a balance of Al.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Park Hoon Mo

Classifications

• F02F3/0084

  the pistons being constructed from specific materials · CPC title

• C22C21/04 Primary

  Modified aluminium-silicon alloys · CPC title

• C22C21/02

  with silicon as the next major constituent · CPC title

• C22C1/026

  Alloys based on aluminium · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title