Low thermal expansion coefficient NaMxAlySiz high entropy alloy and preparation method thereof

A low thermal expansion coefficient, high entropy alloy technology, applied in the field of superalloy materials, can solve the problems of large expansion rate, limited service temperature, steep expansion curve, etc., and achieve the effect of lower thermal expansion coefficient, lower thermal expansion coefficient change rate, and simple process

Active Publication Date: 2014-10-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] SUMMARY OF THE INVENTION Aiming at the shortcomings of current high-temperature low-expansion alloys such as limited service temperature, high expansion rate, and steep expansion curve, a low thermal expansion N a m x Al y Si z High-entropy alloys, alloys, and preparation methods thereof

Method used

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  • Low thermal expansion coefficient NaMxAlySiz high entropy alloy and preparation method thereof
  • Low thermal expansion coefficient NaMxAlySiz high entropy alloy and preparation method thereof
  • Low thermal expansion coefficient NaMxAlySiz high entropy alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] 1. Alloy composition

[0036] The alloy composition of embodiment 1 is Ta 5 Nb 17.5 f 17.5 Zr 17.5 Ti 17.5 Mo 5 W 5 Al 10 Si 5 .

[0037] 2. Alloy melting

[0038] Alloy melting involves the following steps:

[0039] Step 1: The atomic percentage expression of the design alloy composition is Ta 5 Nb 17.5 f 17.5 Zr 17.5 Ti 17.5 Mo 5 W 5 Al 10 Si 5 , then convert the atomic percentage of the determined raw materials into a mass ratio and weigh each raw material respectively;

[0040] Step 2: Set Mo and Ti as a group, W and Hf as a group, and Ta, Nb and Zr as a group, respectively add them to a vacuum arc melting furnace, place them in a crucible at an angle of 20°-40° to the horizontal plane The included angle is smelted twice to obtain a pre-alloyed ingot of two metals, and then all the pre-alloyed ingots of two metals are melted together to obtain a pre-alloyed ingot containing N;

[0041] Step 3: Put the Si and Al weighed in step 1 together with th...

Embodiment 2

[0045] 1. Alloy composition

[0046] The alloy composition of embodiment 2 is Ta 10 Nb 19 f 5 Zr 5 Ti 7 Mo 8 W 35 V 10 Si 1 .

[0047] 2. Alloy melting

[0048] Alloy melting involves the following steps:

[0049] Step 1: The atomic percentage expression of the design alloy composition is Ta 10 Nb 19 f 5 Zr 5 Ti 7 Mo 8 W 35 V 10 Si 1 , and then convert the determined atomic percentage of raw materials into mass ratio and weigh each raw material respectively;

[0050] Step 2: Set Mo and Ti as a group, W and Hf as a group, and Ta, Nb and Zr as a group, respectively add them to a vacuum arc melting furnace, place them in a crucible at an angle of 20°-40° to the horizontal plane The included angle is smelted twice to obtain a pre-alloyed ingot of two metals, and then all the pre-alloyed ingots of two metals are melted together to obtain a pre-alloyed ingot containing N;

[0051] Step 3: Put the V weighed in step 1 and the pre-alloyed ingot containing N obtaine...

Embodiment 3

[0056] 1. Alloy composition

[0057] The alloy composition of embodiment 3 is Ta 8 Nb 5 f 35 Zr 12 Ti 5 Mo 15 W 15 co 1 Al 1 Si 3 .

[0058] 2. Alloy melting

[0059] Alloy melting involves the following steps:

[0060] Step 1: The atomic percentage expression of the design alloy composition is Ta 8 Nb 5 f 35 Zr 12 Ti 5 Mo 15 W 15 co 1 Al 1 Si 3 , and then convert the determined atomic percentage of raw materials into mass ratio and weigh each raw material respectively;

[0061] Step 2: Set Mo and Ti as a group, W and Hf as a group, and Ta, Nb and Zr as a group, respectively add them to a vacuum arc melting furnace, place them in a crucible at an angle of 20°-40° to the horizontal plane The included angle is smelted twice to obtain a pre-alloyed ingot of two metals, and then all the pre-alloyed ingots of two metals are melted together to obtain a pre-alloyed ingot containing N;

[0062] Step 3: Put the Co weighed in Step 1 and the N-containing pre-alloye...

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Abstract

The invention relates to a low thermal expansion coefficient NaMxAlySiz high entropy alloy and a preparation method thereof, the chemical components of the alloy are as follows: 75 <= a <= 100%, 0 <= x <= 10%, 0<= y<= 10%, 0<= z<= 5%, N is arbitrary three or more than three of Ta, Nb, Hf, Zr, Ti, Mo and W, and M is any one or more than one of V, Mn, Fe, Co, Ni and Cr. The alloy phase structure is as follows: a body centered cubic solid solution and an intermetallic compound. The alloy is prepared by arc melting method in three stages. The NaMxAlySiz high entropy alloy has a low thermal expansion coefficient at the temperature in the range of room temperature to 1000 DEG C, the change rate is less than 20%, and the alloy has a broad application prospect in the high temperature industrial field.

Description

technical field [0001] The invention belongs to the field of superalloy materials, in particular to a low thermal expansion coefficient N a m x Al y Si z High-entropy alloys and methods for their preparation. Background technique [0002] The principle of thermal expansion of metals and their alloys is the anharmonic vibration of the lattice lattice, and is affected by the composition, structure and phase transition of the material. Expansion characteristics are represented by linear expansion coefficient or volume expansion coefficient. After heating, the coefficient of volume expansion of ordinary metals increases almost linearly with the increase of temperature. In the temperature range of 20-800°C, the linear expansion coefficient α of ordinary metal materials is about 10-20×10 -6 / °C. In 1896, French physicist C.E.Guialme found that when studying 36Ni-Fe alloy, it had a very small coefficient of thermal expansion (α was about 1.2×10 -6 / °C), this alloy is called ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00
Inventor 吕昭平李世颖王辉刘雄军吴渊何骏阳
Owner UNIV OF SCI & TECH BEIJING
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