Zn-Al alloy having excellent high-speed deformation properties and its making method

Abstract

This invention provides a Zn-Al alloy, which is excellent in static deformability, as well as in dynamic deformability, and can be applied to a large structure, and a process useful for producing the Zn-Al alloy. The Zn-Al alloy comprises Zn: 30 to 99% (% by mass; the same shall apply hereinafter) with the balance consisting of Al and unavoidable impurities, wherein the Zn-Al alloy has a texture comprising a ss phase finely dispersed in an a phase or a' phase having an average grain diameter of not more than 5 [mu]m, the maximum diameter of Al-based inclusions is not more than 50 [mu]m, and, at the same time, pores having a equivalent circle diameter of not less than 0.5 mm are absent, and the macrosegregation of Al is less than 3.0%, and the microsegregation of Al is less than 2.0%.

Description

technical field [0001] The Zn-Al alloy and its manufacturing method of the present invention, particularly a Zn-Al alloy excellent in deformation characteristics at a high strain rate, and its manufacturing method. Here, the Zn-Al alloy is a so-called effective metal for shock-absorbing and shock-absorbing devices that can follow vibrations or skews caused by wind, earthquakes, and the like. Background technique [0002] Conventionally, as the so-called shock isolation and shock absorbing devices that can absorb the strain of wind loads and earthquake loads, or follow skew and shaking, there are dampers made of Pb, anti-vibration rubber, oil dampers, and LYP ( Very low yield point steel) and other devices such as vibration-damping steel plates. However, I. Because anti-vibration rubber has the problem of aging over time, it is not suitable for anti-vibration and vibration-absorbing devices for buildings that require long-term durability. In addition, II. Because oil damper...

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Problems solved by technology

Through the development of this technology, Zn-Al alloys of practical size showing excellent superplasticity at room temperature can be realized, however, there still remain problems to be solved in such Zn-Al alloys

That is, in the alloy developed above, although its strain rate is 10 -3 S -1 It is excellent in deformability at low speed (hereinafter referred to as "static deformability"), and exhibits good superplasticity at room temperature, but the strain rate is 10 -1 S -1 The deformation energy at high speed (hereinafter referred to as "dynamic deformation energy") is unstable when compared to the left and right.

In addition, this phenomenon becomes more prominent as the ingot becomes larger

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