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Compositional gradient films constructed by sputtering in a multicomponent Ti–Al–(Cr, Fe, Ni) system

Published online by Cambridge University Press:  14 August 2018

Yong Zhang Open the ORCID record for Yong Zhang [Opens in a new window] ,
XueHui Yan ,
Jiang Ma ,
ZhaoPing Lu  and
YuHong Zhao
Yong Zhang*
Affiliation:
Beijing Advanced Innovation Center of Materials Genome Engineering & State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; and Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, University of Science and Technology Beijing, Beijing 100083, China
XueHui Yan
Affiliation:
Beijing Advanced Innovation Center of Materials Genome Engineering & State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Jiang Ma
Affiliation:
College of Mechatronic and Control Engineering, Shenzhen University, Shenzhen 518060, China
ZhaoPing Lu
Affiliation:
Beijing Advanced Innovation Center of Materials Genome Engineering & State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
YuHong Zhao
Affiliation:
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
*
a)Address all correspondence to this author. e-mail: drzhangy@ustb.edu.cn
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Abstract

It has been reported that the optimal properties of materials are usually not linear to the configuration entropy of materials; in another word, the high-entropy alloys may not have the best properties among all the alloys, including medium-entropy alloys, thus all of these alloys can be universally named as entropic alloys. For entropic alloys, the design, discovery, and optimization of new materials are more complicated than conventional materials. A technique of high-throughput processing is urgently needed to improve the efficiency. In this paper, a combined method by using multitarget deposition has been proposed for parallel preparation of high-entropy to medium-entropy alloys. Films with compositional gradient were constructed in a pseudo-ternary Ti–Al–(Cr, Fe, Ni) system in this study. To facilitate the characterization of the material library, it has been divided into 144 independent units with an area of 1 cm2 and the maximum value of compositional gradient reaches ∼13 at.%/cm. The material library exhibits a high coverage of composition, and the range of element content varies from 3.3 to 89.2 at.% on average. The stability and homogeneity of the material library were analyzed from phase structure and microtopography. Preliminary screening of the phase structure and properties were performed. The phases are mainly composed of amorphous phase and body-centered cubic phase. Hardness changes nonlinearly with compositions. The material library synthesized in this study is expected to provide an effective platform for high-throughput screening of multicomponent materials.

Keywords

high-entropy alloysmedium-entropy alloyscombinational synthesismaterial librarymulticomponent alloys
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3330 - 3338
Copyright
Copyright © Materials Research Society 2018 

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