Y.-J. Shang, D.-J. Cao, Q. Li, K. Yang, C.-M. Deng, L.-J. Zhang

Application of two-step diffusion couple technique in high-throughput screening of optimal composition and aging temperatures for alloys design: A demonstration in binary Ni-Al system

J. Min. Metall. Sect. B-Metall., 57 (2) (2021) 175-184 DOI:10.2298/JMMB191223011S
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Available online 22 January 2021
(Received 23 December 2019; Accepted 19 January 2021)


In this paper, four binary Ni-13.4 at.% Al/Ni-17.7 at.% Al diffusion couples were first prepared and subjected to homogenization at 1573 K for 10,800 s, from which a continuous concentration profile formed. The three diffusion couples were then cooled down for aging at respective temperatures, i.e., 1,173, 1,123, and 1,073 K, for 14400 s. The effect of composition and aging temperature on the aging microstructure was studied in detail by means of different experimental techniques and statistical analysis. The volume fraction, grain size, and shape factor of γʹ precipitates in the three diffusion couples were plotted as a function of alloy composition and annealing temperatures. Together with the previously proposed evaluation function in which the phase fraction, grain size, and shape factor of γʹ precipitates were chosen as the evaluation indicators, the optimal alloy composition and aging temperature for binary Ni-Al alloys with the best mechanical properties were evaluated, and finally validated by the measured hardness values. The successful demonstration of alloy design in the present binary Ni-Al alloys indicated that the two-step diffusion couple, together with the evaluation function for mechanic properties, should be of generality for high-throughput screening of optimal alloy composition and heat treatment process in different alloys.

Keywords: Two-step diffusion couple; Ni-Al alloys; Microstructure; Hardness; Alloys design

Correspondence Address:
Q. Li *; L.-J. Zhang **,
a Institute of New Materials,
Guangdong Academy of Sciences,
National Engineering Laboratory for Modern
Materials Surface Engineering Technology,
The key Lab of Guangdong for Modern
Surface Engineering Technology, Guangzhou, China;
b State Key Laboratory of Powder Metallurgy,
Central South University, Changsha, Hunan, China;,
email: qinli333@csu.edu.cn *; lijun.zhang@csu.edu.cn **



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