Element for slide fastener

Patent metadata

Field	Value
Publication number	US-10870907-B2
Application number	US-201615765668-A
Country	US
Kind code	B2
Filing date	Sep 20, 2016
Priority date	Oct 8, 2015
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

Provided is an aluminum alloy element for a slide fastener, which has improved strength and abrasion resistance. The element for the slide fastener includes a base material of an aluminum alloy having a composition represented by a general formula: AlaSibCucMgdTieBf in which a, b, c, d, e and f each represents % by mass; a is a balance; 0.2≤b≤0.8, 0.8≤c≤1.8, 0.8≤d≤1.8, 0<e≤0.05, and 0<f≤0.01; and unavoidable impurity elements may be contained; the aluminum alloy comprising, dispersed therein, precipitates containing at least one element selected from a group consisting of Al, Si, Cu and Mg, the element for the slide fastener comprising a pair of leg portions and a head portion that connects the pair or leg portions and comprises a convex portion and a concave portion for engagement.

First claim

What is claimed is:

1. An element for a slide fastener, the element comprising a base material of an aluminum alloy having a composition represented by a general formula: Al a Si b Cu c Mg d Ti e B f in which a, b, c, d, e and f each represents % by mass; a is a balance; 0.2≤b≤0.8, 0.8≤c≤1.8, 0.8≤d≤1.8, 0<e≤0.05, and 0<f≤0.01; and unavoidable impurity elements may be contained; the aluminum alloy comprising, dispersed therein, precipitates containing at least one element selected from a group consisting of Al, Si, Cu and Mg, the element for the slide fastener comprising a pair of leg portions and a head portion that connects the pair or leg portions and comprises a convex portion and a concave portion for engagement.

2. The element for the slide fastener according to claim 1 , wherein the leg portions have an average Vickers hardness of from Hv 140 to Hv 170 in a leg base portion that is a region of the leg portions corresponding to 50% of a length from a base of the leg portions, the length being a length of a perpendicular line drawn from the base of the leg portions toward the tip of the leg portions.

3. The element for the slide fastener according to claim 1 , wherein the leg portions have an average Vickers hardness of from Hv 145 to Hv 170 in a leg base portion that is a region of the leg portions corresponding to 50% of a length from a base of the leg portions, the length being a length of a perpendicular line drawn from the base of the leg portions toward the tip of the leg portions.

4. The element for the slide fastener according to claim 1 , wherein the leg portions have an average Vickers hardness of from Hv 150 to Hv 170 in a leg base portion that is a region of the leg portions corresponding to 50% of a length from a base of the leg portions, the length being a length of a perpendicular line drawn from the base of the leg portions toward the tip of the leg portions.

5. The element for the slide fastener according to claim 1 , wherein the head portion has an average Vickers hardness of from Hv 140 to Hv 170.

6. The element for the slide fastener according to claim 1 , wherein a difference between an average Vickers hardness in a leg base portion and an average Vickers hardness of the head portion is within 10, the leg base portion being a region of the leg portions corresponding to 50% of a length from a base of the leg portions, the length being a length of a perpendicular line drawn from the base of the leg portions toward the tip of the leg portions.

7. The element for the slide fastener according to claim 1 , wherein, when observing a cross section from a direction of viewing both of the pair of leg portions and the head portion, an average aspect ratio of crystal grains in a leg base portion is 5.1 or more, the leg base portion being a region of the leg portions corresponding to 50% of a length from a base of the leg portions, the length being a length of a perpendicular line drawn from the base of the leg portions toward the tip of the leg portions.

8. The element for the slide fastener according to claim 1 , wherein the precipitates comprise at least one type selected from a group consisting of Al-Cu-Mg-based, Mg-Si-based and Al-Cu-Mg-Si-based precipitates.

9. The element for the slide fastener according to claim 8 , wherein among the precipitates, the Al-Cu-Mg-based precipitates account for the highest content.

10. A slide fastener comprising the element for the slide fastener according to claim 1 .

11. An article comprising the slide fastener according to claim 10 .

Assignees

• Ykk Corp
• National Univ Corporation Univ Of Toyama

Inventors

• Ido Tatewaki
• Katsumi Tetsuya
• Mikado Koichi
• Yoshimura Yasuharu
• Matsuda Kenji

Classifications

• C22F1/00

  Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24) · CPC title

• C22C21/08

  with silicon · CPC title

• C22C21/14 Primary

  with silicon · CPC title

• C22C21/16

  with magnesium · CPC title

• C22F1/047

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