纳米NiAl粉末中晶粒尺寸的测定和霍尔-佩奇行为的限制( Grain size determination and limits to Hall-Petch behavior in nanocrystalline NiAl powders )

T Volpp E G?Ring WM Kuschke E Arzt Experimental/ aluminium alloys coherence length grain size heat treatment mechanical alloying microhardness nickel alloys powder technology/ Hall-Petch behavior nanocrystalline NiAl powders grain size determination heat treatment mechanical alloying TEM grain sizes hardness X-ray peak broadening coherence length measurement RMS strains 7 to 80 nm NiAl/ A8120G Preparation of metals and alloys (compacts, pseudoalloys) A6220M Fatigue, brittleness, fracture, and cracks A8140N Fatigue, embrittlement, and fracture A8120E Powder techniques, compaction and sintering A8140G Other heat and thermomechanical treatments / size 7.0E-09 to 8.0E-08 m/ NiAl/bin Al /bin Ni/bin

采用机械合金化方法制备了晶粒尺寸在7～80nm范围内的纳米NiAl粉体，并在一定条件下进行了热处理。进行了显微硬度和纳米压头测量，并用X射线和透射电镜对其进行了表征。研究发现，根据热历史，当晶粒尺寸小于20 nm或硬度增加到7 nm时，材料表现出“逆Hall-Petch行为”。透射电镜测量的晶粒尺寸与X射线峰展宽测量的相干长度非常吻合。根据已有的理论讨论了包括均方根应变在内的结果。

SciDown文献求助系统（解决99%问题） Public Download 爱学术 Elsevier Elsevier Ingenta ResearchGate onAcademic mysciencework.com mendeley.com