Zn-Al Alloy Having Excellent High-Speed Deformation Properties and Process For Producing the Same

a technology of al alloy and high-speed deformation, which is applied in the field of zn-al alloy, can solve the problems of reducing energy absorption capacity, deteriorating vibration-proof rubber, and unsuitable for use, and achieves excellent static deformation

Inactive Publication Date: 2008-08-21
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022]The Zn—Al alloy according to the present invention is excellent in static deformability as well a...

Problems solved by technology

Unfortunately, the vibration proof rubber, which deteriorates with time, is not suitable for use as the seismic isolator or damper of buildings which are required to have long-term durability.
Oil dampers, which need periodic maintenance, are not suitable for use as the seismic isolator or damper of buildings, like the vibration proof rubber.
The vibration controlling steel sheets, for example, LYP undergo work hardening due to permanent set and deteriorate due to repeated loads, with the result that not only do they decrease in energy absorbing capacity but they also become too hard to isolate vibration propagating to structures.
Thus they are limited in use for the seismic isolators or dampers.
Such large dampers, however, are heavy and unhandy.
In addition to these disadvantages, lead toxicity restricts their use in the field of building.
This alloy, however, cannot ...

Method used

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  • Zn-Al Alloy Having Excellent High-Speed Deformation Properties and Process For Producing the Same
  • Zn-Al Alloy Having Excellent High-Speed Deformation Properties and Process For Producing the Same
  • Zn-Al Alloy Having Excellent High-Speed Deformation Properties and Process For Producing the Same

Examples

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example 1

Preparation of Zn—Al Alloy

[0069]Various ingots (each weighing 180 kg) of Zn-22% Al alloy (with less than 0.5% impurities in total) liable to macrosegregation were prepared by casting into an air-cooled or water-cooled iron or copper mold measuring 200×350 mm in cross section, except that sample No. 12 (shown in Table 1) was prepared by continuous casting into a water-cooled copper mold measuring 200×200 mm in cross section.

[0070]The cooling behavior of each ingot was observed with a thermocouple placed in each ingot at the center of the cross section 300 mm above the bottom. FIG. 4 shows cooling curves representing the temperature change with time in the ingot. From the cooling curves were calculated the average cooling rate 1 in the solid-liquid dual phase region (425-375° C.) and the average cooling rate 2 at the temperature (275-250° C.) at which the β phase begins to precipitate. Incidentally, the melt was isolated from the ambient atmosphere during casting by keeping the mold i...

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Abstract

A Zn—Al alloy excellent in static deformability as well as dynamic deformability and applicable to large-sized structures, and a method for production thereof. The alloy contains 30-99% Zn, with the remainder being Al and inevitable impurities, and has a metallographic structure in which the α phase or α′ phase having an average grain size no larger than 5 μm contains the β phase finely dispersed therein, the Al inclusions have a maximum equivalent circle diameter no larger than 50 μm and are free of pores no smaller than 0.5 mm in terms of equivalent circle diameter, and the macrosegregation of Al is less than 3.0% and the microsegregation of Al is less than 2.0%. (% means mass %.)

Description

TECHNICAL FIELD[0001]The present invention relates to a Zn—Al alloy and a method for production thereof. More particularly, the present invention relates to a Zn—Al alloy which exhibits excellent deforming capability when it experiences rapidly applied stresses, and also to a method for production thereof. The Zn—Al alloy disclosed herein is useful for the seismic isolator or damper which permits any building to follow its vibration and strain caused by winds and earthquakes.BACKGROUND ART[0002]There have been contrived several seismic isolators or dampers which absorb or follow strains due to winds or earthquakes. They include lead dampers, vibration proof rubber, oil dampers, and vibration controlling steel sheets, for example, LYP (extra low yield point steel). Unfortunately, the vibration proof rubber, which deteriorates with time, is not suitable for use as the seismic isolator or damper of buildings which are required to have long-term durability. Oil dampers, which need perio...

Claims

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Application Information

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IPC IPC(8): C22F1/053C22C21/10C22C18/04
CPCB22D21/007B22D21/027C22C18/04C22F1/165C22C30/06C22F1/053C22C21/10
Inventor MAKII, KOICHIFURUTA, SEIYATAKAGI, TOSHIAKI
Owner KOBE STEEL LTD
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