Niobium titanium aluminum alloy added with trace boron and preparation method thereof

An aluminum alloy, niobium-titanium technology, applied in the field of niobium-titanium aluminum alloy and its preparation, can solve problems such as value discounts

Inactive Publication Date: 2012-10-03
NAT ENG RES CENT FOR SPECIAL METAL MATERIALS OF TANTALUM & NIOBIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But because hafnium is more expensive, the

Method used

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  • Niobium titanium aluminum alloy added with trace boron and preparation method thereof
  • Niobium titanium aluminum alloy added with trace boron and preparation method thereof
  • Niobium titanium aluminum alloy added with trace boron and preparation method thereof

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Embodiment 1

[0024] In this embodiment, boron as the grain refiner of the Nb-Ti-Al alloy is added in the form of elemental boron, and the atomic percentage of boron is 0.2% of the smelted alloy. The contents of niobium, titanium and aluminum in the alloy after smelting are within the following ranges: 44.8 atomic percent niobium, 40 atomic percent titanium, 15 atomic percent aluminum, and 0.2 atomic percent boron, totaling 100 percent. Its microstructure is as attached figure 2 .

Embodiment 2

[0026] In this embodiment, boron as the grain refiner of Nb-Ti-Al alloy is added in the form of aluminum-boron alloy and aluminum-boron intermetallic compound in any proportion, and the atomic percentage of boron accounts for 0.5% of the alloy ingot after smelting. The contents of niobium, titanium and aluminum in the alloy after smelting are within the following ranges: 44.5 atomic percent niobium, 40 atomic percent titanium, 15 atomic percent aluminum, and 0.5 atomic percent boron, totaling 100 percent. Its microstructure is as attached image 3 .

Embodiment 3

[0028] In this embodiment, boron as the grain refiner of Nb-Ti-Al alloy is added in the form of titanium-boron alloy and titanium-boron intermetallic compound in any proportion, and the atomic percentage of boron accounts for 0.8% of the smelted alloy ingot. The contents of niobium, titanium and aluminum in the alloy after smelting are within the following ranges: 44.2 atomic percent niobium, 40 atomic percent titanium, 15 atomic percent aluminum, and 0.8 atomic percent boron, totaling 100 percent. Its microstructure is as attached Figure 4 .

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Abstract

The invention relates to a niobium titanium aluminum alloy added with trace boron and a preparation method of the alloy, wherein 0.5-5% of boron measured by atomic percent is added in the niobium titanium aluminum alloy. The experiments prove that trace boron (0.5-5%) is added as grain refiner in high-temperature structure materials which contain 30-60% of niobium, 10-50% of titanium and 0-30% of aluminum so as to significantly refine grains and microstructures of the alloy, thereby increasing mechanical property of the alloy, strengthening, toughening and preventing alloy cracking. Main components of the alloy with component region of 0-60% of niobium, 10-50% of titanium and 0-30% of aluminum are beta/B 2 phases, so that the grain refining technology is effective for described component region. Processes for refining niobium titanium aluminum alloy structures with the preparation method provided by the invention are simple and practical, and simultaneously are capable of playing a role of strengthening and toughening the niobium titanium aluminum alloy.

Description

technical field [0001] The invention relates to a niobium-titanium-aluminum alloy added with a trace amount of boron and a preparation method thereof. Background technique [0002] Niobium is the insoluble metal with the lowest density, only 8.57 g / cubic centimeter, and can form an alloy with titanium in infinite solid solution. However, niobium-titanium alloy has superplasticity at 1000 ° C, and its elongation reaches 224%, which limits its high temperature. application. After adding an appropriate amount of aluminum to the niobium-titanium alloy, while significantly improving the high-temperature mechanical strength of the alloy, it can also reduce the density of the alloy and improve the high-temperature oxidation resistance of the alloy, so that it can be used as a high-temperature structural material used at 1000°C to 1300°C . For example, the patent of Melvin R. Jackson of GE Company of the United States has done a kind of density of 6.33g / cm 3 The alloy material co...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C30/00C22C1/03
Inventor 汪燕青刘兆刚刘创红李娜王东新孙本双
Owner NAT ENG RES CENT FOR SPECIAL METAL MATERIALS OF TANTALUM & NIOBIUM
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