Preparation method for ultrafine-grained beryllium-aluminum alloy and product thereof

A technology of beryllium aluminum alloy and ultra-fine grain, which is applied in the field of preparation of ultra-fine grain beryllium aluminum alloy, can solve the problems that it is difficult to obtain uniform, fine and coarse beryllium aluminum alloy grains, and achieve the improvement of mechanical properties, elimination of segregation, and mechanical properties and tissue homogeneity improvement

Inactive Publication Date: 2018-08-03
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide an ultra-fine microstructure of beryllium-aluminum alloys prepared by casting methods, which basically presents coarse columnar dendrites, and it is difficult to obtain beryllium-aluminum alloys with uniform and fine grains and good performance. Preparation method and product of crystal beryllium aluminum alloy

Method used

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  • Preparation method for ultrafine-grained beryllium-aluminum alloy and product thereof
  • Preparation method for ultrafine-grained beryllium-aluminum alloy and product thereof
  • Preparation method for ultrafine-grained beryllium-aluminum alloy and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Each component was weighed according to the following mass percentages: 60wt% beryllium, 40wt% metal aluminum, set aside.

[0036] The ultra-fine-grained beryllium-aluminum alloy is prepared according to the following steps, specifically as follows.

[0037] (1) Pre-alloying of beryllium aluminum alloy

[0038] Put the weighed metal beryllium and aluminum raw materials into the hemispherical water-cooled copper mold crucible of the vacuum arc melting furnace, wherein the aluminum material is placed in the lower part of the crucible, and the beryllium material is placed in the upper part of the crucible. The casting process is as follows: First, the furnace body is evacuated to 5×10 -3 ~3×10 -3 Pa, keep it for 30 minutes, fill it with high-purity argon to 0.3~0.4 MPa, smelting current 410±10 amps, smelting time 5±0.5 minutes, repeat smelting 6~8 times, after cooling, obtain pre-alloyed beryllium aluminum alloy ingot.

[0039] (2) After the pre-alloyed beryllium alumi...

Embodiment 2

[0042] Each component was weighed according to the following mass percentages: 62wt% beryllium, 38wt% metal aluminum, set aside.

[0043] The ultra-fine-grained beryllium-aluminum alloy is prepared according to the following steps, specifically as follows.

[0044] (1) Pre-alloying of beryllium aluminum alloy

[0045] Put the weighed metal beryllium and aluminum raw materials into the alumina ceramic crucible of the vacuum induction melting furnace, wherein the aluminum material is placed on the upper part of the crucible, and the beryllium material is placed on the lower part of the crucible. The casting process is: the vacuum degree is controlled at 5×10 -2 ~1×10 -2 Pa, the melting temperature is 1365±15 degrees Celsius, the melting time is 44±2 minutes, the holding temperature is 1340±15 degrees Celsius, the holding time is 2.5±0.5 minutes, and the pouring temperature is 1310±10 degrees Celsius. The smelted melt is poured into a mold to obtain a pre-alloyed beryllium alu...

Embodiment 3

[0049] Each component was weighed according to the following mass percentages: 78wt% beryllium, 22wt% metal aluminum, set aside.

[0050] The ultra-fine-grained beryllium-aluminum alloy is prepared according to the following steps, specifically as follows.

[0051] (1) Pre-alloying of beryllium aluminum alloy

[0052] Put the weighed metal beryllium and aluminum raw materials into the zirconia ceramic crucible of the vacuum induction melting furnace, wherein the aluminum material is placed in the lower part of the crucible, and the beryllium material is placed in the upper part of the crucible. The casting process is: the vacuum degree is controlled at 2.1×10 -2 ~8.5×10 -3 Pa, the melting temperature is 1375±15 degrees Celsius, the melting time is 45±3 minutes, the holding temperature is 1365±10 degrees Celsius, the holding time is 3.5±0.5 minutes, and the pouring temperature is 1300±5 degrees Celsius. The smelted melt is poured into a mold to obtain a pre-alloyed beryllium...

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Abstract

The invention discloses a preparation method for an ultrafine-grained beryllium-aluminum alloy and a product thereof, belongs to the field of non-ferrous metal alloy preparation, and aims at solving the problems that the microstructure of a beryllium-aluminum alloy prepared through a casting method presently is basically presented as thick columnar dendrites, and a beryllium-aluminum alloy with uniform and fine crystalline grains and good performance is difficultly obtained. According to the preparation method disclosed by the invention, mixing and dissolving for alloy components are realizedthrough pre-alloying, rapid cooling for a melt is realized under the condition of a low superheat degree, and finally the novel ultrafine-grained beryllium-aluminum alloy with fine and compact beryllium crystalline grains, uniformly-sized microstructure and equiaxed grains is obtained, so that the mechanical property and the structure uniformity of the beryllium-aluminum alloy are greatly improvedcompared with an alloy in a slowly-cooled state, and meanwhile, segregation is greatly eliminated and the formation of pin holes is suppressed. On the basis of improvement for the preparation method,the beryllium-aluminum alloy disclosed by the invention is more excellent in mechanical property and microstructure, so that more application needs of the special beryllium-aluminum alloy material can be met.

Description

technical field [0001] The invention relates to the field of non-ferrous metal alloy preparation, especially the field of beryllium-aluminum alloy manufacturing, and specifically relates to a preparation method of ultra-fine-grained beryllium-aluminum alloy and a product thereof. Background technique [0002] Metal beryllium has many characteristics superior to other metals or materials, such as low density, high melting point, high specific strength and specific stiffness, high thermal conductivity, small thermal expansion coefficient, small thermal neutron absorption cross section, and good X-ray penetration. Based on the above characteristics of beryllium, it has been widely used in nuclear industry, aerospace, inertial navigation and civil high-tech fields. However, the inherent brittle defects of beryllium limit its large-scale industrial application. [0003] To this end, people have carried out the development and application of beryllium aluminum alloy. Beryllium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C25/00B22D11/06B22D18/06
CPCC22C1/02B22D11/0611B22D18/06C22C25/00
Inventor 余良波王晶杨苏张晨周福印张俊鲍永鑫
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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