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Quick setting block aluminum alloy with high strength and high ductibility and toughness and method for preparing same

An aluminum alloy and high-strength technology, which is applied in the field of high-strength, high-ductility, and rapidly-solidifying bulk aluminum alloys and their preparation, can solve the problems of complexity, low amorphous forming ability, and tensile brittleness obstacles of amorphous alloys, and achieves Simple preparation method and low equipment cost

Inactive Publication Date: 2012-05-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Al-based amorphous alloys have never broken through the size constraints. Professor D.B. Miracle of the United States prepared the largest-sized Al-based amorphous alloy Al 89 Ni 6 La 5 It is 780 microns thick, so far it has not been possible to prepare millimeter-scale bulk Al-based amorphous alloys
Its low amorphous formation ability severely limits the research and development of Al-based alloys, and the tensile brittleness of amorphous alloys has always been the biggest obstacle to its application as structural materials.
[0004] Professor Akihisa Inoue from Tohoku University in Japan and others have prepared an Al-based alloy with nano-sized grains by using the Al-based amorphous powder hot extrusion method (Hot Extrusion), which has a certain hardness (250Vickers) and relatively high fracture strength. (900MPa), but its production and preparation process includes smelting, powder making, hot pressing and other methods, which are relatively complicated

Method used

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  • Quick setting block aluminum alloy with high strength and high ductibility and toughness and method for preparing same
  • Quick setting block aluminum alloy with high strength and high ductibility and toughness and method for preparing same
  • Quick setting block aluminum alloy with high strength and high ductibility and toughness and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The aluminum-based alloy Al90Ni4Y6 uses pure Al according to the atomic percentage, and the ratio of pure Ni and pure Y is good. It is placed in a vacuum electric arc furnace, and the vacuum is better than 5×10 -3 Pa, and then rush into argon for protection melting. The alloy is smelted at least 3 times to ensure its homogeneity. The pattern master alloy is taken out from the electric arc furnace and put into a quartz tube after being coarsely crushed, and put into a rapid solidification equipment heated by an electromagnetic induction coil. The rapid solidification block aluminum-based alloy is prepared by spray casting method and cooled by a copper mold. The specific steps are as follows :

[0024] (1) Put the aluminum-based alloy into a quartz tube with a circular nozzle, put the quartz tube together with the master alloy in a vacuum high-frequency induction furnace, place the plaster mold at the injection position, and evacuate to 5×10 -3 Pa.

[0025] (2) After t...

Embodiment 2

[0029] The composition of the aluminum base alloy is Al89Ni4Y7, and the rapid solidification aluminum base alloy is prepared by copper mold suction casting method. Adopt the same alloy smelting method as in Example 1. After the master alloy is melted evenly, place it in the suction casting cavity, and use an electric arc to melt the master alloy for the second time. After the alloy is completely melted to about 100°C above the melting point, turn on the suction casting switch and turn on the suction casting. The mechanical pump valve of the casting cavity uses the pressure difference between the melting cavity and the suction casting mold cavity to suck the molten alloy into the copper mold in the mold cavity.

Embodiment 3

[0031] The composition of the aluminum-based alloy is Al89Ni5Y6, and graphite is used as the material for spray casting or suction casting molds. After the master alloy is smelted for the second time in the same way as in Examples 1 and 2, the alloy is completely melted and kept at 50-100 degrees above the melting point for 2 to 5 minutes, and the spray casting pressure is adjusted to about 0.5-5 MPa, and the spray casting switch is turned on , the molten Al alloy is injected into the graphite mold with high density by using air flow and pressure difference, and the alloy workpiece is taken out after the alloy is rapidly solidified. The alloy pattern prepared by using graphite as the mold material has better mechanical properties than the copper mold, which is reflected in the higher yield strength of some components. figure 2 It is shown that Al-based bulk rapidly solidified alloys prepared using graphite molds have the highest strength exceeding 1 GPa.

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Abstract

The invention relates to an aluminum alloy with a high-intensity high-toughness fast-solidifying block and a preparation method thereof. The alloy is an aluminum-based alloy; the component thereof is Al<100-X-y>M<x>RE<y>; wherein, M is one of the transition element of Fe or Ni; RE refers to one or the combination of a plurality of the rare earth elements of La, Ce, Y, Gd and Yb; the change range of the component thereof is as follows: X is equal to or more than 2 and is equal to or less than 10; Y is equal to or more than 2 and is equal or less than 10; the rest is Al. The preparation method of the alloy includes: batching each element according to the atom components; protecting an arc furnace or an induction furnace to be uniformly smelted by utilizing inert gases; a mother alloy after being secondarily melted is poured into a cold mold and then is fast solidified, prepared and shaped. The alloy has a splat cooling area tissue, has a highest intensity exceeding 1Gpa, has an excellent compression plastic deformation capacity, can be used as a light-quality high-specific strength structural material and has an excellent application prospect.

Description

technical field [0001] The invention relates to an aluminum alloy and a preparation method thereof, in particular to a rapidly solidified block aluminum alloy with high strength, high ductility and toughness and a preparation method thereof. Background technique [0002] As a lightweight alloy, aluminum alloy has become one of the most widely used metal materials at present. Due to its light weight and high specific strength, it can be used as an aircraft cover. Its mature technology and low cost also make it widely used as a beverage packaging material. use. Under high-strength engineering application conditions, the yield strength of superhard aluminum alloys is only 500-600MPa. Compared with other alloys, the lower yield strength has become the bottleneck of the application of aluminum alloys. [0003] As the frontier of rapid solidification alloy development, amorphous alloy has become a research hotspot in the field of metals due to its ultra-high yield strength, speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C45/08C22C1/03
Inventor 张涛亚瓦瑞·阿兰李岩乔治亚克斯·高斯塔斯勒穆莱克·阿兰逄淑杰
Owner BEIHANG UNIV