Precipitation and martensitic transformation of fcc-Ti in Nb-Ti-Si based ultrahigh temperature alloys

Xiao Ma; Xiping Guo; Maosen Fu; Yanqiang Qiao

doi:10.1016/j.intermet.2015.11.001

Precipitation and martensitic transformation of fcc-Ti in Nb-Ti-Si based ultrahigh temperature alloys

Xiao Ma, Xiping Guo, Maosen Fu, Yanqiang Qiao

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The morphologies, crystallographic characteristics and phase transitions of Ti precipitates developed in arc-melted and heat-treated Nb-Ti-Si based ultrahigh temperature alloys have been investigated by high resolution transmission electron microscopy (HRTEM). Rod-like Ti precipitates with fcc structure could only be found at interfaces in the arc-melted specimens, while ultrafine fcc-Ti precipitates formed inside Nbss in the heat-treated specimens. The fcc-Ti precipitates at interfaces partially transformed into hcp-Ti lamellas through a martensitic transformation during heat-treatment, and twins composed of different directional hcp-Ti lamellas formed in the fcc-Ti matrix with the orientation relationship (OR): _[110]fcc-Ti//_[112¯0]M//_[1¯1¯20]T. The precipitation mechanisms of fcc-Ti grains in Nbss and hcp-Ti lamellas in fcc-Ti matrix have been analyzed.

Original language	English
Pages (from-to)	17-23
Number of pages	7
Journal	Intermetallics
Volume	70
DOIs	https://doi.org/10.1016/j.intermet.2015.11.001
State	Published - 1 Mar 2016

Keywords

Electron microscopy transmission
Interfaces
Intermetallics
Martensitic transformation
Phase stability

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title = "Precipitation and martensitic transformation of fcc-Ti in Nb-Ti-Si based ultrahigh temperature alloys",

abstract = "The morphologies, crystallographic characteristics and phase transitions of Ti precipitates developed in arc-melted and heat-treated Nb-Ti-Si based ultrahigh temperature alloys have been investigated by high resolution transmission electron microscopy (HRTEM). Rod-like Ti precipitates with fcc structure could only be found at interfaces in the arc-melted specimens, while ultrafine fcc-Ti precipitates formed inside Nbss in the heat-treated specimens. The fcc-Ti precipitates at interfaces partially transformed into hcp-Ti lamellas through a martensitic transformation during heat-treatment, and twins composed of different directional hcp-Ti lamellas formed in the fcc-Ti matrix with the orientation relationship (OR): [110]fcc-Ti//[112¯0]M//[1¯1¯20]T. The precipitation mechanisms of fcc-Ti grains in Nbss and hcp-Ti lamellas in fcc-Ti matrix have been analyzed.",

keywords = "Electron microscopy transmission, Interfaces, Intermetallics, Martensitic transformation, Phase stability",

author = "Xiao Ma and Xiping Guo and Maosen Fu and Yanqiang Qiao",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2016",

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doi = "10.1016/j.intermet.2015.11.001",

language = "英语",

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T1 - Precipitation and martensitic transformation of fcc-Ti in Nb-Ti-Si based ultrahigh temperature alloys

AU - Ma, Xiao

AU - Guo, Xiping

AU - Fu, Maosen

AU - Qiao, Yanqiang

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The morphologies, crystallographic characteristics and phase transitions of Ti precipitates developed in arc-melted and heat-treated Nb-Ti-Si based ultrahigh temperature alloys have been investigated by high resolution transmission electron microscopy (HRTEM). Rod-like Ti precipitates with fcc structure could only be found at interfaces in the arc-melted specimens, while ultrafine fcc-Ti precipitates formed inside Nbss in the heat-treated specimens. The fcc-Ti precipitates at interfaces partially transformed into hcp-Ti lamellas through a martensitic transformation during heat-treatment, and twins composed of different directional hcp-Ti lamellas formed in the fcc-Ti matrix with the orientation relationship (OR): [110]fcc-Ti//[112¯0]M//[1¯1¯20]T. The precipitation mechanisms of fcc-Ti grains in Nbss and hcp-Ti lamellas in fcc-Ti matrix have been analyzed.

AB - The morphologies, crystallographic characteristics and phase transitions of Ti precipitates developed in arc-melted and heat-treated Nb-Ti-Si based ultrahigh temperature alloys have been investigated by high resolution transmission electron microscopy (HRTEM). Rod-like Ti precipitates with fcc structure could only be found at interfaces in the arc-melted specimens, while ultrafine fcc-Ti precipitates formed inside Nbss in the heat-treated specimens. The fcc-Ti precipitates at interfaces partially transformed into hcp-Ti lamellas through a martensitic transformation during heat-treatment, and twins composed of different directional hcp-Ti lamellas formed in the fcc-Ti matrix with the orientation relationship (OR): [110]fcc-Ti//[112¯0]M//[1¯1¯20]T. The precipitation mechanisms of fcc-Ti grains in Nbss and hcp-Ti lamellas in fcc-Ti matrix have been analyzed.

KW - Electron microscopy transmission

KW - Interfaces

KW - Intermetallics

KW - Martensitic transformation

KW - Phase stability

UR - http://www.scopus.com/inward/record.url?scp=84954128792&partnerID=8YFLogxK

U2 - 10.1016/j.intermet.2015.11.001

DO - 10.1016/j.intermet.2015.11.001

M3 - 文章

AN - SCOPUS:84954128792

SN - 0966-9795

VL - 70

SP - 17

EP - 23

JO - Intermetallics

JF - Intermetallics

ER -

Precipitation and martensitic transformation of fcc-Ti in Nb-Ti-Si based ultrahigh temperature alloys

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Keywords

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