纳米晶Fe-10Cr-3Al粉末在球磨、退火和快速固结过程中的结构演变

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe-10Cr-3Al Powder.

作者信息

Kumar Rajiv, Bakshi S R, Joardar Joydip, Parida S, Raja V S, Singh Raman R K

机构信息

IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

出版信息

Materials (Basel). 2017 Mar 9;10(3):272. doi: 10.3390/ma10030272.

DOI:10.3390/ma10030272

PMID:28772633

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5503399/

Abstract

Structural changes during the deformation-induced synthesis of nanocrystalline Fe-10Cr-3Al alloy powder via high-energy ball milling followed by annealing and rapid consolidation by spark plasma sintering were investigated. Reduction in crystallite size was observed during the synthesis, which was associated with the lattice expansion and rise in dislocation density, reflecting the generation of the excess grain boundary interfacial energy and the excess free volume. Subsequent annealing led to the exponential growth of the crystallites with a concomitant drop in the dislocation density. The rapid consolidation of the as-synthesized nanocrystalline alloy powder by the spark plasma sintering, on the other hand, showed only a limited grain growth due to the reduction of processing time for the consolidation by about 95% when compared to annealing at the same temperature.

摘要

研究了通过高能球磨制备纳米晶Fe-10Cr-3Al合金粉末，随后进行退火，并通过放电等离子烧结进行快速固结过程中的结构变化。在合成过程中观察到晶粒尺寸减小，这与晶格膨胀和位错密度增加有关，反映了过量晶界界面能和过量自由体积的产生。随后的退火导致晶粒呈指数生长，同时位错密度下降。另一方面，与在相同温度下退火相比，通过放电等离子烧结对合成的纳米晶合金粉末进行快速固结时，由于固结处理时间减少了约95%，仅显示出有限的晶粒生长。