Method for predicting phase structure of Al-series high-entropy alloy based on Md-delta
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A high-entropy alloy and phase structure technology, applied in testing metal structure, testing metal, material inspection products, etc., can solve problems such as poor applicability, and achieve the effect of reducing preparation cost, avoiding waste and improving efficiency
Pending Publication Date: 2021-10-19
SHANGHAI UNIV OF ENG SCI
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[0005] The purpose of the present invention is to overcome the defects of poor applicability of the existing high-entropy alloy phase structure prediction method, and provide a high-entropy alloy phase structure prediction method with good applicability
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Embodiment 1
[0024] A method for predicting the phase structure of Al-based high-entropy alloys based on Md-δ, specifically for the analysis of high-entropy alloys AlCoCr with different Fe contents 0.5 Fe x Ni 2.5 The phase composition of , its steps are:
[0025] (1) Al-based target high-entropy alloy is AlCoCr 0.5 Fe x Ni 2.5 (x=0.5, 1.5, 2.5, 3.5), by In the formula, xi is the atomic percentage of the i component, (Md)i represents the Md value of the i component, and the calculation of the atomic radius difference is as follows:
[0026]
[0027] Where: δ r is the atomic radius difference parameter, is the weighted average atomic radius of all components, r i is the atomic radius of component i, c i is the atomic fraction of component i. Calculation available: AlCoCr 0.5 Fe 0.5 Ni 2.5 of δ r =5.580%; AlCoCr0.5Fe1.5Ni2.5 δ r =5.276%; AlCoCr0.5Fe2.5Ni2.5 δ r =5.009%; AlCoCr0.5Fe3.5Ni2.5 δ r = 4.774%;
[0028] (2) According to the relationship between Md-δ an...
Embodiment 2
[0032] A method for predicting the phase structure of Al-based high-entropy alloys based on Md-δ, specifically for the analysis of high-entropy alloys with different Al contents x The phase composition of CoCrFeNi (x=0.25, 1.25), its steps are:
[0033] (1) Al-based target high-entropy alloy is Al x CoCrFeNi (x=0.25, 1.25), can be calculated by the formula as described in embodiment 1: Al0.25CoCrFeNi δ r =3.477%; Al1.25CoCrFeNi δ r = 6.116%;
[0034] (2) According to the relationship between Md-δ and phase structure, Al can be predicted 0.25 The CoCrFeNi alloy has an FCC phase structure in the as-cast state, and the Al 1.25 CoCrFeNi alloy forms an ordered structure or forms an intermetallic compound in the as-cast state;
[0035] (3) According to the phase structure and expression of Al-based target high-entropy alloys, the atomic percentages of each component were obtained and converted into weight percentages before alloying and smelting. Vacuum arc melting methods ...
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Abstract
The invention discloses a method for predicting the phase structure of an Al-series high-entropy alloy based on Md-delta, which comprises the following steps: firstly, calculating the average Md value and the average delta value of an Al-series target high-entropy alloy, then obtaining the phase structure of the Al-series target high-entropy alloy according to the relationship between the average Md value and the average delta value, obtaining the weight percentage of each component according to the phase structure and the expression of the Al-series target high-entropy alloy, and finally weighing each component according to the weight percentage, and carrying out alloying smelting to obtain the Al-series target high-entropy alloy. According to the method, the phase structure of the Al-series high-entropy alloy is predicted based on the relation between the delta and Md of the high-entropy alloy and the phase composition of the high-entropy alloy, and then the ideal phase composition is obtained; the method is simple, accurate and reliable, great waste of cost and time caused by the fact that the phase structure of the alloy can be known only by analyzing the alloy after actual smelting in the prior art is avoided, the efficiency of preparing the Al-series high-entropy alloy can be effectively improved, the preparation cost of the Al-series high-entropy alloy is reduced, and the method has great application prospects.
Description
technical field [0001] The invention belongs to the technical field of alloy composition design, and relates to a method for predicting the phase structure of Al series high-entropy alloys based on Md-δ. Background technique [0002] In 2004, Professor Ye Junwei, a scholar from Taiwan, creatively broke through the development bottleneck of traditional alloys, and proposed a brand-new alloy design concept, using various metal elements as the main alloy elements, and mixing them in equal or similar proportions to obtain alloys. The high entropy effect produced by the mixing of multi-principal components makes the alloy have better mechanical properties, corrosion resistance and wear resistance, especially at low temperature, it can well realize the unity of material strength and plasticity, which has high research value and development of applications. [0003] In the past ten years, the research and development of high-entropy alloys has been extremely active and has attract...
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