Ti22Al25NbxV alloy preparation method based on powder metallurgy method

A powder metallurgy and alloy technology, applied in the field of Ti2AlNb alloy preparation, can solve problems such as coarse structure and poor mechanical properties, and achieve the effect of reducing alloy density, refining alloy grains, and optimizing alloy structure

Active Publication Date: 2018-07-31
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a Ti22Al25NbxV alloy preparation method based on powder metallurgy, which solves the problems of coarse structure and poor mechanical properties of Ti2AlNb-based alloys in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In a protective atmosphere, weigh titanium powder, aluminum powder and niobium powder respectively at a molar ratio of 53:22:25, mix the weighed powders and put them into a ball mill jar with a protective atmosphere; Ball milling in a ball mill tank filled with protective gas for 2 hours at a speed of 900 rpm to obtain Ti22Al25Nb alloy composite powder.

[0036] Combined with the design capacity of the mold, press molding in a protective atmosphere with a pressure of 800Mpa and hold the pressure for 10 minutes; after 10 minutes, repress the obtained alloy pressed sample, press again to 700Mpa, hold the pressure for 1 minute, and then demould to obtain Ti22Al25Nb alloy preform.

[0037] In a protective atmosphere, stress relief annealing is performed on the alloy preform, the annealing temperature is 200°C, the heating rate is 10°C / min, and the heat preservation is 2h; in the protective atmosphere, the stress relief annealed alloy preform is sintered, and the sintering t...

Embodiment 2

[0046] In a protective atmosphere, weigh titanium powder, aluminum powder, niobium powder and vanadium powder respectively at a molar ratio of 52:22:25:1, mix the weighed powders and put them into a ball mill tank with a protective atmosphere; The obtained mixed powder is ball milled in a ball mill tank filled with protective gas for 3 hours at a speed of 800 rpm to obtain Ti22Al25Nb1V alloy composite powder.

[0047] Combined with the design capacity of the mold, press molding in a protective atmosphere with a pressure of 900Mpa and hold the pressure for 10 minutes; after 10 minutes, repress the obtained alloy pressed sample, press again to 800Mpa, hold the pressure for 1 minute, and then demould to obtain Ti22Al25Nb1V alloy preform.

[0048] In a protective atmosphere, stress relief annealing is performed on the alloy preform, the annealing temperature is 220°C, the heating rate is 10°C / min, and the heat preservation is 2h; in a protective atmosphere, the stress relief annea...

Embodiment 3

[0057] In a protective atmosphere, weigh titanium powder, aluminum powder, niobium powder and vanadium powder respectively at a molar ratio of 51:22:25:2, mix the weighed powders and put them into a ball mill tank with a protective atmosphere; The obtained mixed powder is ball milled in a ball mill tank filled with protective gas for 4 hours at a speed of 700 rpm to obtain a Ti22Al25Nb2V alloy composite powder.

[0058] Combining with the design capacity of the mold, press molding in a protective atmosphere, the pressure is 1000Mpa, and the pressure is kept for 10 minutes; after 10 minutes, the obtained alloy pressed sample is repressed, and the pressure is applied again to 900Mpa, and the pressure is kept for 1min, and then demoulded, and the obtained Ti22Al25Nb2V alloy preform.

[0059] In a protective atmosphere, stress relief annealing is performed on the alloy preform, the annealing temperature is 240°C, the heating rate is 10°C / min, and the heat preservation is 2h; in th...

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PUM

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Abstract

The invention discloses a Ti22Al25NbxV alloy preparation method based on a powder metallurgy method. The method comprises the following steps: (1) Ti22Al25NbxV alloy composite powder is prepared; (2)the alloy composite powder obtained in the step (1) is pressed in a mold for molding to obtain a Ti22Al25NbxV alloy pre-molded body; (3) the alloy pre-molded body obtained in the step (2) is sinteredto prepare a Ti22Al25NbxV alloy infiltration sintered body; and (4) the alloy infiltration sintered body obtained in the step (3) is heated to obtain a Ti22Al25NbxV alloy. The preparation method realizes near-net molding to save raw materials, adopts cold-pressing molding to reduce the preparation cost, and maintains the performances when the alloy density is reduced.

Description

technical field [0001] The invention belongs to the technical field of Ti2AlNb alloy preparation, and relates to a method for preparing Ti22Al25NbxV alloy based on a powder metallurgy method. Background technique [0002] Ti2AlNb-based alloys have good strength, high temperature creep resistance, antimagnetic properties, fracture toughness and low density, and can serve for a long time at 650-800 ° C or a short time at a higher temperature range, and are used as aircraft engines in the aerospace industry Great expectations have been placed on the alternative materials of traditional high-density nickel-based superalloys. [0003] The preparation of Ti2AlNb-based alloys by vacuum consumable smelting is a common forming method: calculate the ratio according to the composition design requirements, mix the weighed pre-alloyed blocks evenly, and press them in the corresponding molds; welding and pressing the pre-alloyed The rod body becomes a consumable electrode; several times ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00C22F1/18
CPCC22C1/0458C22C14/00C22F1/183
Inventor 王俊勃李笑然胡新煜姜凤阳刘松涛思芳张娇娇马万鹏黄健
Owner XI'AN POLYTECHNIC UNIVERSITY
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