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Ti2AlNb base alloy

A technology of base alloy and alloy composition, applied in the field of Ti-Al intermetallic compounds, can solve the problems of low toughness, inability to manufacture large ingots, etc., and achieve the effect of good oxidation resistance

Active Publication Date: 2016-02-17
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this high Al / Nb ratio alloy has crossed the Ti 2 The composition range of the AlNb-based alloy becomes a TiAl-based intermetallic compound material based on the γ phase, and this type of material cannot be used to manufacture large ingots and large forgings due to low plasticity and toughness

Method used

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Examples

Experimental program
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Effect test

Embodiment 1～4

[0016] The ingredients of Examples 1-4 are shown in Table 1. Button ingots with 4 ingredients were prepared using a non-consumable vacuum melting furnace, and the weight of the ingredients was 50 g. The test process is as follows: According to the mass percentages of the ingredients shown in Table 1, calculate and weigh the raw materials required for 50g ingot casting, taking component 2 as an example, weigh 22.29g of titanium sponge, 5.31g of pure aluminum foil, and 19.12g of pure Nb Cut, 0.85g molybdenum powder, 0.81g sponge zirconium, 1.59g pure hafnium bar, wrap the molybdenum powder into particles with aluminum foil, put all the raw materials into the crucible of the non-consumable vacuum furnace, smelt after vacuuming, complete the smelting and After cooling, turn the button ingot over and put it into the crucible again, and melt it again, repeating the melting for a total of 5 times to ensure the uniform composition. Follow the same method to complete the smelting of th...

Embodiment 5～12

[0020] The batching composition of Examples 5-12 is shown in Table 2, and the ingot was prepared according to the batching composition shown in Table 2, and the batching weight was 112kg. Ingots were prepared by three vacuum consumable melting processes. The process is: ingredient calculation, raw material weighing, piezoelectric electrode (electrode specification is A single electrode block weighs 7kg), welding electrodes and vacuum consumable melting. The raw materials required to prepare ingots include: titanium sponge, pure aluminum beans, Al-75Nb alloy, Al-60Mo alloy, zirconium sponge, pure hafnium flakes and Al-10Si alloy. First, calculate the single electrode according to the mass percentage of the ingredients The amount of various raw materials required, after mixing, is pressed in the special mold of the hydraulic press to form 16 electrode blocks are pressed for each component; 4 electrode blocks are welded into a long electrode, and one smelting is carried out, ...

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Abstract

The invention provides Ti2AlNb base alloy. The Ti2AlNb base alloy is characterized by comprising, by atomic percent, 20%-25% of Al, 20%-24% of Nb, 0.3%-2% of Mo, 0.5%-2% of Zr, 0.01%-0.5% of Hf, 0-0.8% of Si and the balance Ti and inevitable impurities; and the sum of Mo, Zr, Hf and Si is larger than or equal to 1.0%. The Ti2AlNb base alloy has good high-temperature oxidation resistance, room temperature plasticity, high-temperature tensile strength and endurance performance.

Description

technical field [0001] The present invention is a Ti 2 An AlNb-based alloy belongs to the field of Ti-Al intermetallic compounds. Background technique [0002] Ti-Al intermetallic compounds have the advantages of low density, high specific strength, and good oxidation resistance, and are candidates for high-temperature structural parts used at temperatures above 650°C. Early studies on Ti-Al alloys mainly focused on Ti 3 Al-based alloys and TiAl-based two types of materials, through the Ti 3 Adding Nb element to Al-based alloy, in Ti 3 The introduction of B2 phase into Al-based alloys can significantly improve the room temperature ductility and toughness of the alloys, represented by Ti-25Al-10Nb-3V-1Mo (α 2 +B2) Two-phase Ti 3 Al-based alloys have been developed rapidly. In 1988, researchers such as Banerjee worked on strengthening and toughening Ti 3 In the study of Al-based alloys, it was found that with the increase of Nb content, a component in the alloy formed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00C22C27/02C22C1/02
CPCC22C1/02C22C14/00C22C27/02C22C30/00C22F1/18C22F1/183
Inventor 曹京霞周毅王宝
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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