ALUMINUM ALLOY PLASTIC WORKING MATERIAL AND PRODUCTION METHOD THEREFOR

• US 20190316241A1
• Filed: 06/30/2017
• Published: 10/17/2019
• Est. Priority Date: 07/12/2016
• Status: Active Application

• Current Assignee: Nippon Light Metal Company Limited (Nippon Light Metal Holdings Co., Ltd.)
• Original Assignee: Nippon Light Metal Company Limited (Nippon Light Metal Holdings Co., Ltd.)
• Inventors: YU, Jun, ISHIWATA, Yasuo, SHiMOSAKA, Dalsuke, KONDO, Takutoshi, TAGUCHI, Yoshihiro
• Application Number:
  US16/316,974
• Publication Number:
  US 20190316241A1
• Time in Patent Office: Days
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: C22F 1/04 of aluminium or alloys based thereon

Abstract

The present invention provides an aluminum alloy plastic working material which has a low Young'"'"'s modulus, but has an excellent proof stress and a method for efficiently producing the same. The aluminum alloy plastic working material of the present invention comprises: 5.0 to 10.0 wt % of Ca, and the remainder aluminum and unavoidable impurities, a volume ratio of an Al₄Ca phase, which is a dispersed phase, is 25% or more. The Al₄Ca phase comprises a tetragonal Al₄Ca phase and a monoclinic Al₄Ca phase, and an intensity ratio (I₁/I₂) of the highest diffraction peak (I₁) attributed to the tetragonal system to the highest diffraction peak (I₂) attributed to the monoclinic system, which are obtained by an X-ray diffraction measurement, is 1 or less.

Claims

1. An aluminum alloy plastic working material, which comprises:

5.0 to 10.0 wt % of Ca, and

the remainder aluminum and unavoidable impurities,

a volume ratio of an Al₄Ca phase, which is a dispersed phase, is 25% or more,

the Al₄Ca phase comprises a tetragonal Al₄Ca phase and a monoclinic Al₄Ca phase, and

an intensity ratio (I₁/I₂) of the highest diffraction peak (I₁) attributed to the tetragonal system to the highest diffraction peak (I₂) attributed to the monoclinic system, which are obtained by an X-ray diffraction measurement, is 1 or less.

2. The aluminum alloy plastic working material according to claim 1, further comprising at least one or more of Fe:

0.05 to 1.0 wt % and Ti;

0.005 to 0.05 wt %.

3. The aluminum alloy plastic working material according to claim 1,

wherein an average crystal grain size of the Al₄Ca phase is 1.5 μ

m or less.

7. The aluminum alloy plastic working material according to claim 2, wherein an average crystal grain size of the Al₄Ca phase is 1.5 μ

m or less.

4. A method for producing an aluminum alloy plastic working material, comprising:

a first step for obtaining a plastic workpiece of an aluminum alloy by subjecting an aluminum alloy ingot which contains 5.0 to 10.0 wt % of Ca with the remainder aluminum and inevitable impurities, and has a volume ratio of an Al₄Ca phase which is a dispersed phase of 25% or more to a plastic processing, and

a second step for subjecting to a heat treatment in a temperature range of 100 to 300°

C.

5. The method for producing an aluminum alloy plastic working material according to claim 4, wherein aluminum alloy ingot contains at least one or more of Fe:

0.05 to 1.0 wt % and Ti;

0.005 to 0.05 wt %.

6. The method for producing an aluminum alloy plastic working material according to claim 4, wherein, before the first step, the aluminum alloy ingot is not subjected to a heat treatment where the ingot is maintained at a temperature of 400°

C. or more.