WROUGHT MATERIAL COMPRISING Cu-Al-Mn-BASED ALLOY EXCELLENT IN STRESS CORROSION RESISTANCE AND USE THEREOF

Patent metadata

Field	Value
Publication number	US-2016130683-A1
Application number	US-201614997185-A
Country	US
Kind code	A1
Filing date	Jan 15, 2016
Priority date	Jul 16, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

A wrought material containing a Cu—Al—Mn-based alloy, in which an existence frequency of a coincidence grain boundary with a Σ value of 3 or less is 35% or more but 75% or less, and which has a recrystallized microstructure substantially formed from a β single phase; and the use thereof.

First claim

1 . A wrought material comprised of a Cu—Al—Mn-based alloy, wherein the wrought material has an alloy composition comprising: 5 to 10 mass % of Al; 5 to 20 mass % of Mn; optionally 2 mass % or less of Ni; and optionally 0.001 to 10 mass % in total of at least one element selected from the group consisting of Co, Fe, Ti, V, Cr, Si, Nb, Mo, W, Sn, Mg, P, Be, Sb, Cd, As, Zr, Zn, and Ag, in which the at least one element is selected from the group consists of: Co 0.001 to 2 mass %, Fe 0.001 to 3 mass %, Sn 0.001 to 1 mass %, Ti 0.001 to 2 mass %, V, Nb, Mo and Zr respectively 0.001 to 1 mass %, Cr 0.001 to 2 mass %, Si 0.001 to 2 mass %, W 0.001 to 1 mass %, Mg 0.001 to 0.5 mass %, P 0.01 to 0.5 mass %, Be, Sb, Cd and As respectively 0.001 to 1 mass %, Zn 0.001 to 5 mass %, and Ag 0.001 to 2 mass %, with the balance being Cu and unavoidable impurities,
which is excellent in superelastric characteristics,
in which an existence frequency of a coincidence grain boundary with a Σ value of 3 or less is 35% or more but 75% or less, and
which has a recrystallized microstructure in which a proportion occupied by a β phase in the recrystallized microstructure is 98% or more.

2 . The wrought material comprised of a Cu—Al—Mn-based alloy as claimed in claim 1 , in which an existence frequency of a coincidence grain boundary with a Σ value of 29 or less is 45% or more but 90% or less.

3 . The wrought material comprised of a Cu—Al—Mn-based alloy as claimed in claim 1 , which is excellent in stress corrosion resistance.

4 . The wrought material comprised of a Cu—Al—Mn-based alloy as claimed in claim 1 , wherein the wrought material is a sheet or a rod, wherein an existence ratio of grains having a grain size of (1/2) or more of a sheet thickness or a wire diameter of the wrought material in a cross section in a longitudinal direction is 80% or more of the cross-sectional area, and wherein an average grain size of the grains is in the range of 0.8 times to 2.5 times more than the sheet thickness or the wire diameter of the wrought material.

5 . A correcting tool for ingrown toenail comprised of the wrought material of a Cu—Al—Mn-based alloy as claimed in claim 1 .

6 . An orthosis for hallux valgus comprised of the wrought material of a Cu—Al—Mn-based alloy as claimed in claim 1 .

7 . A structural member comprised of the wrought material of a Cu—Al—Mn-based alloy as claimed in claim 1 .

8 . A spectacle frame comprised of the wrought material of a Cu—Al—Mn-based alloy as claimed in claim 1 .

9 . An actuator comprised of the wrought material of a Cu—Al—Mn-based alloy as claimed in claim 1 .

10 . A connector comprised of the wrought material of a Cu—Al—Mn-based alloy as claimed in claim 1 .

Assignees

• Furukawa Techno Mat Co Ltd
• Furukawa Electric Co Ltd
• Univ Tohoku

Inventors

• Kise Sumio
• Tanaka Toyonobu
• Nakamizo Kenji
• Ishikawa Koji
• Fujii Misato
• Omori Toshihiro
• Kainuma Ryosuke

Classifications

• A61C2201/007

  using shape memory effect · CPC title

• A61L31/022

  Metals or alloys · CPC title

• A61C7/20

  Arch wires (A61C7/28 takes precedence) · CPC title

• A61L31/14

  Materials characterised by their function or physical properties {, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials} · CPC title

• C22C9/01 Primary

  with aluminium as the next major constituent · CPC title