Preparation method of ultrafine grained Ni-Al alloy

A technology of nickel-aluminum alloy and ultra-fine grain, which is applied in the field of alloy preparation, can solve the problems of low density and low mechanical properties of NiAl alloy, and achieve the effect of improving the strength at room temperature

Inactive Publication Date: 2010-10-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing ultrafine-grained nickel-aluminum alloys in order to solve the problems of low density and low mechanical properties of NiAl alloys prepared by existing methods

Method used

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  • Preparation method of ultrafine grained Ni-Al alloy
  • Preparation method of ultrafine grained Ni-Al alloy
  • Preparation method of ultrafine grained Ni-Al alloy

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specific Embodiment approach 1

[0008] Specific Embodiment 1: The preparation method of ultra-fine-grained nickel-aluminum alloy in this embodiment is as follows: 1. Mechanical alloying: according to the ratio of nickel to aluminum atomic ratio of 1:1, nickel powder and aluminum powder are mixed and then added to a high-energy ball mill , and add absolute ethanol, the amount of absolute ethanol added is 3~5% of the volume fraction of nickel and aluminum mixed powder, and then under the protection of argon, ball mill at a speed of 280~320r / min, and each ball mill is 0.5 h, stop for 0.5h, the effective ball milling time is 18~24h, and the ball mill tank is cooled by circulating water to obtain completely alloyed nickel-aluminum alloy powder; 2. Vacuum hot pressing sintering: put the fully alloyed nickel-aluminum alloy powder into graphite mold, and then put the graphite mold into the vacuum hot-press sintering furnace, and vacuum the vacuum hot-press sintering furnace to 1.3×10 -2 Pa, and then heated to 1200~1...

specific Embodiment approach 2

[0009] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the addition of absolute ethanol in step one is 4% of the volume fraction of nickel and aluminum mixed powder. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, ball milling is performed at a speed of 290-310 R / min. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a preparation method of an alloy, in particular to an ultrafine grained Ni-Al alloy, which solves the problem that the Ni-Al alloy prepared by the prior art has low density and poor mechanical property. The method comprises the steps of: 1. mechanical alloying; and 2. sintering in a vacuum hotpressing way to obtain the ultrafine grained Ni-Al alloy. The prepared ultrafine grained Ni-Al alloy has average crystal grain size of about 400nm and Vickers hardness average value of 450; compared with as-cast state coarse-grained Ni-Al alloy, room temperature strength of the ultrafine grained Ni-Al alloy is improved greatly by about 800 MPa; and meanwhile, the room temperature dependent variable is improved to 9.5% from 5%.

Description

technical field [0001] The invention relates to a method for preparing an alloy. Background technique [0002] At present, NiAl alloys prepared by vacuum melting and directional solidification methods are complicated in process and require high equipment. At the same time, NiAl alloys with fine grains cannot be obtained under high density requirements. In this way, the mechanical properties of the NiAl alloy are not ideal; at the same time, due to the low density of the NiAl alloy, its oxidation resistance is significantly reduced. Contents of the invention [0003] The object of the present invention is to provide a method for preparing ultra-fine-grained nickel-aluminum alloys in order to solve the problems of low density and low mechanical properties of NiAl alloys prepared by existing methods. [0004] The preparation method of the ultra-fine-grained nickel-aluminum alloy of the present invention is as follows: 1. Mechanical alloying: the nickel powder and the aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C19/03
Inventor 张凯锋徐桂华
Owner HARBIN INST OF TECH
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