Abstract
Mechanical alloying is among the few cost effective techniques for synthesizing nanocrystalline alloy powders. This article reviews mechanical alloying or ball-milling of (NC) powders of Fe-Cr alloys of different compositions, and the remarkable oxidation resistance of the NC alloy. The article also reviews challenges in thermal processing of the mechanically alloyed powders (such as compaction into monolithic mass) and means to overcome the challenges.
Highlights
Nanocrystalline (NC) structure of alloys (instead of their traditional microcrystalline (MC) counterparts) is reported to remarkably improve some of the properties, such as strength and corrosion resistance [1,2,3,4]
Mechanical alloying of powders of the constituent elements is among the most commonly employed approaches for producing NC alloys [2,4,5,6]
The grain growth impeding due to impurities is more readily offered by alloying elements with greater compared with those reported in the literature for ball-milled powders of NC Fe and an Fe-Al alloy [9,23,24,25,26,27,28]
Summary
Nanocrystalline (NC) structure of alloys (instead of their traditional microcrystalline (MC) counterparts) is reported to remarkably improve some of the properties, such as strength and corrosion resistance [1,2,3,4]. Mechanical alloying of powders of the constituent elements is among the most commonly employed approaches for producing NC alloys [2,4,5,6]. This article reviews challenges in consolidation of mechanically alloyed Fe-Cr powders into monolithic solids and their sintering for achieving close-to-theoretical density, and circumvention of the challenges. The article presents examples of improvements in oxidation/corrosion resistance properties of a few alloy systems due to the NC structure, and their mechanistic explanations. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
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