Multi-alloying beta-phase-solidified high Nb-TiAl alloy and preparation method thereof

A technology of multiple alloys and alloys, applied in the field of alloys, to achieve the effect of easy operation and simple process of the process

Active Publication Date: 2014-05-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing researches only focus on high Nb-TiAl alloys with single addition of β-phase stabilizing elements, but about the preparation of multi-component alloyed β-phase solidified high Nb-TiAl alloy materials and the addition of multiple β-phase stabilizing elements W and Cr in high Nb -Physical metallurgical behavior in TiAl alloys has not been reported

Method used

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  • Multi-alloying beta-phase-solidified high Nb-TiAl alloy and preparation method thereof
  • Multi-alloying beta-phase-solidified high Nb-TiAl alloy and preparation method thereof
  • Multi-alloying beta-phase-solidified high Nb-TiAl alloy and preparation method thereof

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Embodiment 1

[0024] The preparation of the multi-alloyed β-phase solidification high Nb-TiAl alloy of this embodiment is achieved through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, aluminum-tungsten-niobium master alloy and electrolytic chromium flakes , Of which Ti46.3at.%, Al45at.%, Nb8at.%, W0.2at.%, Cr0.5at.%; 2. The raw materials weighed in step 1 are pressed into a metal briquetting machine. First put the titanium sponge on the inner edge of the mold, and then the bottom of the area enclosed by the titanium sponge is the high-purity aluminum layer, the aluminum-niobium intermediate alloy layer, the electrolytic chromium sheet, the aluminum-tungsten-niobium intermediate alloy layer and the sponge. Titanium layer; 3. Put the compact obtained in step 2 into a centrifugal pourable water-cooled copper crucible vacuum induction levitation melting furnace. Before melting, preheat the metal mold to 400℃, and ...

Embodiment 2

[0027] The preparation of the multi-alloyed β-phase solidification high Nb-TiAl alloy of this embodiment is achieved through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, aluminum-tungsten-niobium master alloy and electrolytic chromium flakes , Including Ti48.3at.%, Al43at.%, Nb8at.%, W0.2at.%, Cr0.5at%; 2. The raw materials weighed in step 1 are pressed into a metal briquetting machine, and the first Place the titanium sponge on the inner edge of the mold, and then the bottom of the area enclosed by the titanium sponge is high-purity aluminum layer, aluminum-niobium intermediate alloy layer, electrolytic chromium sheet, aluminum-tungsten-niobium intermediate alloy layer and titanium sponge Layer; 3. Put the compact obtained in step 2 into a centrifugal pourable water-cooled copper crucible vacuum induction levitation melting furnace, preheat the metal mold to 500°C before melting, and pump the wa...

Embodiment 3

[0030] The preparation of the multi-alloyed β-phase solidification high Nb-TiAl alloy of this embodiment is achieved through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, aluminum-tungsten-niobium master alloy and electrolytic chromium flakes , Among which Ti47.6at.%, Al44at.%, Nb8at.%, W0.1at.%, Cr0.3at%; 2. The raw materials weighed in step 1 are pressed into a metal briquetting machine. Place the titanium sponge on the inner edge of the mold, and then the bottom of the area enclosed by the titanium sponge is high-purity aluminum layer, aluminum-niobium intermediate alloy layer, electrolytic chromium sheet, aluminum-tungsten-niobium intermediate alloy layer and titanium sponge Layer; 3. Put the compact obtained in step 2 into a centrifugal pourable water-cooled copper crucible vacuum induction levitation melting furnace, preheat the metal mold to 300 ℃ before melting, and pump the water-cooled c...

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Abstract

The invention provides a multi-alloying beta-phase-solidified high Nb-TiAl alloy and a preparation method thereof, and belongs to the technical field of alloy. The alloy comprises the following elements in molar percentage: 43-45% of Al, 5-15% of Nb, no greater than 0.2% of W, no greater than 0.5% of Cr, and the balance of Ti and inevitable impurities; raw materials are formed by briquetting according to the ratio; firstly, a titanium sponge is placed on the inner edge of a mold; secondly, a high pure aluminium layer, an aluminium niobium middle alloy layer, an electrolyzed chromium piece, an aluminium tungsten niobium middle alloy layer, and a titanium sponge layer are arranged sequentially from the bottom up respectively; the briquetting is placed a water cooled copper crucible vacuum induction suspend smelting furnace capable of realizing centrifugal casting; the melt is obtained through smelting under vacuuming, and is mixed uniformly; the melt is cast into a metal mold which is preheated and perform centrifugal rotation for performing centrifugal rotation,, and is cooled along with the furnace. According to the method, the uniform fine TiAl alloy without obvious segregation is obtained.

Description

Technical field [0001] The invention relates to a high Nb-TiAl alloy and a preparation process thereof, in particular to a multi-element alloying beta phase solidification casting high Nb-TiAl alloy and a preparation method thereof, and belongs to the technical field of alloys. Background technique [0002] TiAl alloy is considered to be a very promising light and high temperature structural material due to its advantages of low density, low expansion coefficient, high specific strength, high elastic modulus and better high temperature creep resistance and oxidation resistance. In the fields of aviation, aerospace and automobile. However, the shortcomings of TiAl alloys such as low room temperature plasticity and poor hot workability limit its wide application. Scientists have conducted extensive research on the structure, plasticity and deformation of TiAl alloys and show that β-phase solidification can effectively improve the mechanical properties and hot workability of TiAl a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C14/00C22C1/03
Inventor 陈子勇宫子琪周峰柴丽华相志磊
Owner BEIJING UNIV OF TECH
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