Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1991-11-27
1993-09-07
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
75351, C22C 4508
Patent
active
052425134
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an aluminum-chromium based alloy and a method of preparing the same, and more particularly, it relates to an aluminum-chromium based alloy which has high strength and an excellent heat resistance, corrosion resistance and the like.
BACKGROUND INFORMATION
Amorphous aluminum alloys are disclosed in Japanese Patent Laying-Open Gazette No. 1-275732, Japanese Patent Laying-Open Gazette No. 64-47831 and Japanese Patent Publication Gazette No. 1-127641, for example. The amorphous aluminum alloys disclosed in these Japanese Patent Publications contain La, or Nb, Ta, Hf, Y and the like as essential alloy components. An Al-Si-X alloy and an Al -Ce-X alloy are described in Transactions of the Japan Institue of Metals, Vol. 28, No. 12, p. 968.
The amorphous alloys disclosed in the aforementioned prior art examples are prepared by a super-rapid solidification method in most cases. According to another method an amorphous alloy can be prepared by a mechanical alloying method. In addition to the aforementioned two methods, a vapor phase deposition method, an electrolytic deposition method, an electron beam irradiation method, an extra-high pressure method and the like are known as methods for obtaining amorphous alloys. However, these methods have not yet been industrialized due to considerable practical limitations.
An amorphous alloy prepared by the super-rapid solidification method or the mechanical alloying method has not satisfied both, mechanical and economical properties. In other words, an amorphous alloy having excellent mechanical properties contains high-priced elements. An amorphous alloy containing only low-priced elements has inferior mechanical properties. An amorphous alloy is crystallized by heating. If the crystallization temperature of the amorphous alloy is too low, it is impossible to perform a sufficient warm solidification of the alloy powder. Also with a view to actual use, it is difficult to use such an amorphous alloy having a low crystallization temperature since the upper limit of the available temperatures is lowered.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an aluminum-chromium based alloy which can satisfy both mechanical and economical properties.
Another object of the present invention is to provide an aluminum-chromium based alloy which has a high crystallization temperature.
Still another object of the present invention is to provide a method for preparing an aluminum-chromium based alloy which can satisfy both mechanical and economical properties.
A further object of the present invention is to provide a method of preparing an aluminum-chromium based alloy which has a high crystallization temperature.
It has been found that an aluminum-chromium based alloy containing an amorphous phase can be obtained by preparing an Al-Cr-X based alloy by a novel method. It has also been found that the above described aluminum-chromium based alloy containing an amorphous phase has a high crystallization temperature, and has excellent material characteristics. Such an Al-Cr-X based alloy is also economical since low-priced Cr is used as a raw material
An attempt for obtaining an Al-Cr amorphous alloy is disclosed in Transactions of the Japan Institute of Metals, Vol. 28, No. 8 (1987), p. 679, for example. While a vapor-phase method, i.e., an RF sputtering method, is employed in this prior art, only a quasi-crystalline structure, which is thermodynamically more stable than an amorphous phase, is obtained by this method. In general, it has been recognized that absolutely no amorphous phase is obtained in an Al-Cr based alloy even if a super-rapid solidification method or a mechanical alloying method is employed.
As described above, it has been difficult to convert an A -Cr based alloy to an amorphous state. In order to implement such amorphous conversion of an Al-Cr based alloy, the inventors have found the following two points to be important. novel alloy composition. treatment method implementing conversi
REFERENCES:
patent: 4347076 (1982-08-01), Ray et al.
patent: 4383970 (1983-05-01), Komuro et al.
patent: 4789605 (1988-12-01), Kubo et al.
patent: 5028494 (1991-07-01), Tsujimura et al.
patent: 5053084 (1991-10-01), Masumoto et al.
Japanese Institute of Metals, vol. 28, No. 12, p. 968.
Transactions of the Japan Institute of Metals. vol. 28, No. 8 (1987), p. 679 "Formation of Al-Cr Quasicrystal Films by RF-Sputtering".
Kobayashi Kojiro
Takeda Yoshinobu
Fasse W. G.
Sumitomo Electric Industries Ltd.
Wyszomierski George
LandOfFree
Method of preparing on amorphous aluminum-chromium based alloy does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of preparing on amorphous aluminum-chromium based alloy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of preparing on amorphous aluminum-chromium based alloy will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-484625