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Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2113
Author(s):  
Alan Savan ◽  
Timo Allermann ◽  
Xiao Wang ◽  
Dario Grochla ◽  
Lars Banko ◽  
...  

Multiple principal element alloys, also often referred to as compositionally complex alloys or high entropy alloys, present extreme challenges to characterize. They show a vast, multidimensional composition space that merits detailed investigation and optimization to identify compositions and to map the composition ranges where useful properties are maintained. Combinatorial thin film material libraries are a cost-effective and efficient way to create directly comparable, controlled composition variations. Characterizing them comes with its own challenges, including the need for high-speed, automated measurements of dozens to hundreds or more compositions to be screened. By selecting an appropriate thin film morphology through predictable control of critical deposition parameters, representative measured values can be obtained with less scatter, i.e., requiring fewer measurement repetitions for each particular composition. In the present study, equiatomic CoCrFeNi was grown by magnetron sputtering in different locations in the structure zone diagram applied to multinary element alloys, followed by microstructural and morphological characterizations. Increasing the energy input to the deposition process by increased temperature and adding high-power impulse magnetron sputtering (HiPIMS) plasma generators led to denser, more homogeneous morphologies with smoother surfaces until recrystallization and grain boundary grooving began. Growth at 300 °C, even without the extra particle energy input of HiPIMS generators, led to consistently repeatable nanoindentation load–displacement curves and the resulting hardness and Young’s modulus values.


2017 ◽  
Vol 131 ◽  
pp. 410-418 ◽  
Author(s):  
Zimin Chen ◽  
Yi Zhuo ◽  
Ruiqin Hu ◽  
Wenbin Tu ◽  
Yanli Pei ◽  
...  

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
L. Isern ◽  
S. Impey ◽  
H. Almond ◽  
S. J. Clouser ◽  
J. L. Endrino

2016 ◽  
Vol 45 (24) ◽  
pp. 9970-9976 ◽  
Author(s):  
Daniel J. Martin ◽  
Brian D. McCarthy ◽  
Eric S. Rountree ◽  
Jillian L. Dempsey

Traverse the EC′ Zone Diagram with a molecular H2-evolving electrocatalyst through systematic variation of the acid pKa, scan rate, acid concentration and catalyst concentration.


Author(s):  
D. V. Khatian ◽  
M. A. Gindikina ◽  
E. A. Nelin

2015 ◽  
Vol 212 (12) ◽  
pp. 2798-2804 ◽  
Author(s):  
Helge Stein ◽  
Dennis Naujoks ◽  
Dario Grochla ◽  
Chinmay Khare ◽  
Ramona Gutkowski ◽  
...  

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