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Method for synthesizing low-temperature stable intermediate phase

A low-temperature stable, mesophase technology, applied in the field of metal materials, can solve the problems of slow formation kinetics, unobservable, difficult preparation, etc., to achieve simple preparation process, avoid the risk of oxidation and gas inclusion introduction, high purity Effect

Pending Publication Date: 2022-06-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low temperature (3 V and FeV 3 Wait

Method used

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  • Method for synthesizing low-temperature stable intermediate phase
  • Method for synthesizing low-temperature stable intermediate phase
  • Method for synthesizing low-temperature stable intermediate phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1

[0034] Raw materials in this example: manganese powder, aluminum powder.

[0035] The mesophase synthesis process includes the following steps:

[0036] (1) First use the first principles to calculate as figure 2 As shown, the Ts temperature of the obtained τ phase is 1080K (807°C), and the mass ratio of the two alloy elements manganese / aluminum is 7:3.

[0037] (2) According to the mass ratio of each alloy element, weigh an appropriate amount of manganese powder and aluminum powder, mix and compact to form preform 3 .

[0038] (3) Place the preform 3 on the figure 1 In the lower mold 2 shown, the lower mold 2 can be rotated, there is a gap 1 between the upper mold 2 and the lower mold 4, the upper mold 4 applies the hydrostatic pressure of 4GPa to it to compact the mixed material, and the lower mold 2 rotates 30 circles to make The compacted preform 3 undergoes shear plastic deformation at room temperature, and realizes micro-mixing between alloy eleme...

Embodiment 2

[0041] Example 2

[0042] Raw materials in this example: manganese powder, aluminum block.

[0043] In this embodiment, the preform 3 is prepared by digging holes in the aluminum block and filling the manganese powder. The other procedures are the same as in Example 1.

Embodiment 3

[0045] Example 3

[0046] Raw materials in this example: iron powder, vanadium powder.

[0047] The mesophase synthesis process includes the following steps:

[0048] (1) First, first-principles calculations were used to obtain the disorder-order transition temperature of iron-vanadium alloys with equal atomic ratio, that is, the Ts of the mesophase ordered solid solution FeV-P4 / nmm was 1350K (1077°C); Figure 7 shown.

[0049] (2) According to the atomic ratio of alloying elements in the mesophase ordered solid solution FeV-P4 / nmm, an appropriate amount of iron powder and vanadium powder are weighed, mixed and compacted to form a preform 3 .

[0050] (3) Place the preform 3 on the figure 1 In the lower mold 2 shown, the upper mold 4 applies a hydrostatic pressure of 6GPa to compress the mixed material, and the lower mold 2 rotates 50 circles, so that the compacted preform 3 undergoes shear plastic deformation at room temperature to realize the alloying elements. The inter...

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Abstract

The invention relates to the field of metal materials, in particular to a method for synthesizing a low-temperature stable intermediate phase. Comprising the following steps: 1) calculating and predicting according to a low-temperature stable intermediate phase, and determining components of the intermediate phase and a stable highest Kelvin temperature Ts; 2) according to the components of the intermediate phase, combining element blocks or mixing and compacting powder to prepare a preformed blank; 3) at lt; severe shear deformation of the prefabricated blank is conducted at the temperature of 0.99 Ts, high-density crystal defects and the like are put into the prefabricated blank, on one hand, the diffusion speed is increased, on the other hand, the storage energy of the prefabricated blank is increased, and nucleation of an intermediate phase is promoted; 4) at lt; and the deformed preformed blank is annealed for 0.1-500 hours at the temperature of 0.99 Ts, so that the intermediate phase grows up. The intermediate phase is prepared without smelting and solidification processes of traditional metallurgy, nucleation and growth of a low-temperature stable intermediate phase cannot be hindered due to the fact that a corresponding high-temperature stable phase in a phase diagram appears in the solidification process, and design and preparation of the intermediate phase are liberated from limitation of a traditional metallurgy method.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a method for synthesizing a low-temperature stable intermediate phase. Background technique [0003] When an alloy is formed between metal elements, in addition to forming a solid solution (terminal solid solution) with each component as the matrix, a new phase with a different crystal structure from each component can also be formed. Since the position of these new phases on the phase diagram is always in the middle of the composition interval, these phases are usually called intermediate phases. Its crystal structure is generally different from its components, and its physical, chemical and mechanical properties are also very different. The intermediate phase can be an intermetallic compound with a narrow composition range and simple stoichiometry, or a solid solution based on an intermetallic compound with a wide composition range (called a secondary solid solution). Interme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C33/02B22F3/02B22F3/24C21D8/00
CPCC22C33/02B22F3/02B22F3/24C21D8/00C22C1/047Y02E40/60
Inventor 王经涛丁成洋邢跃李政刘瑛
Owner NANJING UNIV OF SCI & TECH
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