Primary and secondary precipitates in a hierarchical-precipitate-strengthened ferritic alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:706

Article

Song, Gian¹  Sun, Zhiqian¹  Poplawsky, Jonathan D.²  Xu, Xiandong³  Chen, Mingwei³  Liaw, Peter K.¹ 

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[3] Tohoku Univ, World Premier Int Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

关键词: Atom probe tomography;    Ferritic steels;    Heusler phases;    Precipitation;    Transmission electron microscopy (TEM);   

DOI  :  10.1016/j.jallcom.2017.02.271

来源: Elsevier

【 摘 要 】

The microstructures of a hierarchical-precipitate-strengthened ferritic alloy are characterized, using transmission-electron microscopy (TEM) and atom-probe tomography (APT). The alloy shows duplex precipitates. The primary precipitate with an average edge length of 90 nm consists of NiAl -and Ni2TiAl-type phases, while the secondary precipitate with an average radius of 2 nm is a NiAl-type phase. Based on the APT results, the volume fractions of the primary and secondary precipitates were calculated, using the lever rule to be 17.3 and 2.3%, respectively. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free