Abstract
The present work is focused on the synthesis of CoCrFeMnNi high entropy alloy (HEA) interstitially alloyed with nitrogen via powder metallurgy routes. Using a simple method, nitrogen was introduced to the HEA from the protective N2 gas atmosphere during mechanical alloying (MA) processing. The lattice parameter and amount of nitrogen in HEA were observed to be linearly proportional to the milling duration. The limited solubility of nitrogen in the main face centered cubic (FCC) phase resulted in the in-situ formation of nitrides and, accordingly, significant increase in the hardness values. It has been shown that fabrication of such nitrogen-doped HEA bulk materials can be conveniently achieved by a simple combination of MA + spark plasma sintering processes, without the need for adding nitrogen from other sources.
Highlights
The need for safety critical application materials with improved combination of high strength, low density, and high fracture resistance has been stimulating research efforts for decades [1]
We focus on the production of interstitial CoCrFeMnNi-N high entropy alloys via
We focus on the production of interstitial CoCrFeMnNi-N high entropy alloys via simple and economical method of reactive milling of elemental powders in nitrogen atmosphere
Summary
The need for safety critical application materials with improved combination of high strength, low density, and high fracture resistance has been stimulating research efforts for decades [1]. High entropy alloys (HEA) consisting of several substitutional elements at near-equiatomic ratios, as well as composites derived from them have been developed [2,3,4]. These deviated from the established, single element-based alloy designs and possessed a combination of promising properties. It has been proven that the introduction of interstitial elements to HEA lattices promoted further significant strengthening This is done without sacrificing ductility in the process, further pushing the eminent borders of the strength-ductility trade-off [7,8,9,10].
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