JPS5950147A - High-strength and high-toughness aluminum alloy - Google Patents

Abstract

PURPOSE:To obtain an Al alloy with superior strength and toughness, by adding specified amounts of transition elements such as Mn, Cr and Zr to an Al-Mg-Si alloy. CONSTITUTION:0.05-0.8% Mn and 0.05-0.35% Cr and/or 0.05-0.20% Zr are added to an Al-Mg-Si alloy contg. 0.9-1.8% Si, 0.8-1.4% Mg and 0.4-1.8% Cu and having relation represented by Si content-Mg content/1.73>=0.3%. An Al alloy with superior strength and toughness suitable for use as a material for a baseball bat, a tent pole, a bobbin, bicycle parts, etc. is obtd.

Description

[Detailed description of the invention]

The present invention relates to a high-strength, high-toughness aluminum alloy, and particularly to a high-strength, high-toughness aluminum alloy used in, for example, baseball bats, tent poles, hobbins, bicycle parts, and the like. In addition, in this specification, "%" refers to "% by weight".
” shall be indicated. Conventionally, 86066 is well known as a high strength Δl-Mg-Si alloy. This A6066 alloy is
In addition to the hardening elements of N4g, Si, and Cu, N41] is added as a transitional element, but A6025, A6025,
Compared to 6061 alloy, etc., it has high strength due to the high content of Mg and Si, but it has a disadvantage of inferior toughness because it contains only Mn as a transition element that promotes toughness. This invention was made with the urgent aim of developing a high-strength and high-toughness aluminum alloy. They discovered that by containing the transition elements Zr and Zr in specific ranges, it was possible to create an aluminum alloy with significantly improved toughness while possessing high strength comparable to H-6066 alloy. It is something. That is, the aluminum comb alloy according to the present invention has Si:Q
, 9-18% Mg: 0.8-], 4% Cub 04-18% (However, S1 content - Mg content / 173≧0.
396)

[In addition, M If: (l
Q 5-08% CI': 0.05-035% '': 0.05-0.2096 Contains at least 1 l- of 2 or more species, with the remainder consisting of aluminum and inevitable impurities. Also Si, M
G, Cu are hardening elements that mainly act to increase strength, and Mn, Cr, and Zr are transition elements that mainly act to increase toughness. Therefore, Si is less than 0.9%, Mg or 0896 is less than 10,000, and C
If u is less than 0.4%, the desired high strength cannot be achieved. On the other hand, when Si and Cu exceed 18% and Mg exceeds 14%, extrudability, ductility,
Since it causes low toughness, it is excluded from the composition range of this invention. However, even within the above range, Si must always be contained in the excess Si composition range above 0396 relative to Mg. That is, in the range of S1 content - Mg content / 173≧03%, the content of Sl is defined as 1C4';'('+), and when it deviates from this, a sufficient desired effect in terms of strength must be achieved. Mn, Cr and Zr may be contained in a combination of two or more of them, but it is particularly preferred that Mn is an essential component and Cr and 7. From the viewpoint of improving toughness, it is desirable to contain at least one of the following in combination with Mn, Cr and Z.
If the r content is less than 0.005%, it will not be sufficient to achieve the desired toughness improvement effect, and conversely, if Mn exceeds 0.08% and Cr exceeds 0.35%. , or when Zr exceeds 0.20%, coarse intermetallic compounds are formed, resulting in a decrease in strength, toughness, and ductility. -Since it is a Mg-5i alloy, it not only has good extrudability, corrosion resistance, and workability, but also has both high strength and toughness, which makes it difficult to replace the conventional 2000 series, which is relatively expensive. Alternatively, it can be provided at low cost as a material that can be used as an alternative to high-strength aluminum alloys such as No. 7000 series.Next, examples of the present invention are shown together with comparative examples.Example Table-1 (W [%) Comparative alloy 1...A606] Comparative alloy 2...A6205 Comparative alloy 3...A60G
Fillet fillet of 1 white 7 roe finch (strained 560°)
Cte + OII! After being equalized for 1 hour, it was made into a bar with a diameter of 30 mm. Next, at 550°C] l14'' Nil solution treated water removal//l'i17
, at 180°C between 7 [1] and 1:1" effect treatment? i
−+ and others were used as samples. (7) For each sample, JIS 4 test piece (this 1 + ts force 1 stitch, 1 more, (go: (,,: [111 force, elongation, 1, and Charpy opposition ""/+ 41'+ were defined as I.
'i,! I: 1・Enter 2 small pieces. As is clear from the results described above, this invention (aluminum (r gold) corresponds to the conventional A 6066 alloy in Gensho Example 3, J<3\, 11. - It is a good pile with good mechanical strength (tensile strength, yield strength),
A few yen higher in toughness 1. This alloy has high toughness equivalent to that of the conventional A6061 alloy shown in Example 1. that's all

Claims (1)

[Claims] Contains +ns1: o9 to 18% Mg: Q8 to 1.4% Cu; Q4 to 18% (However, Si content - Mg content / 173≧03
%), and Mn: 0.05-0.8% Cr: QQ5-035% 7, r: 0.05-020% Two or more of these should be made into a gold phase, and the remainder should consist of aluminum and inevitable impurities. High strength, high toughness aluminum alloy. A high-strength, high-toughness aluminum alloy according to claim 1, characterized in that it contains f21Mn as an essential component, a metal phase, and one or more of Zr and Zr. .