Quantitative study of surface relief produced by formation of lamellar microstructure in a γ-TiAl based alloy

Xiaolei Li; Jinshan Li; Hongchao Kou; Lin Song; Tiebang Zhang

doi:10.1016/j.matlet.2016.11.042

Quantitative study of surface relief produced by formation of lamellar microstructure in a γ-TiAl based alloy

Xiaolei Li, Jinshan Li, Hongchao Kou, Lin Song, Tiebang Zhang

School of Materials Sience and Engineering

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

7 Scopus citations

Abstract

Surface relief produced during lamellar transformation in a Ti48Al2Cr2Nb (at.%) alloy was quantitatively studied. Three-dimensional representations and quantitative data exhibit there are three kinds of surface reliefs, single-tilt, regular-terrace and irregular-strip, corresponding to narrow-width, moderate-width and large-width lamellae, respectively. Observation on fine structure reveals that kinks and ledges of the three kinds of surface reliefs are different. All the surface reliefs are related to diffusional terrace-ledge-kink growth mechanism and only single-tilt surface relief combines displacive character. The γ lamellae grow forward by nucleation of growth islands one upon the other and increase length and width by kink migration. The kink density and size control the lateral growth and further determine the lamellar width.

Original language	English
Pages (from-to)	134-137
Number of pages	4
Journal	Materials Letters
Volume	188
DOIs	https://doi.org/10.1016/j.matlet.2016.11.042
State	Published - 1 Feb 2017

Keywords

Atomic force microscopy
Intermetallic alloys and compounds
Phase transformation
Surface relief
TiAl

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10.1016/j.matlet.2016.11.042

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title = "Quantitative study of surface relief produced by formation of lamellar microstructure in a γ-TiAl based alloy",

abstract = "Surface relief produced during lamellar transformation in a Ti48Al2Cr2Nb (at.%) alloy was quantitatively studied. Three-dimensional representations and quantitative data exhibit there are three kinds of surface reliefs, single-tilt, regular-terrace and irregular-strip, corresponding to narrow-width, moderate-width and large-width lamellae, respectively. Observation on fine structure reveals that kinks and ledges of the three kinds of surface reliefs are different. All the surface reliefs are related to diffusional terrace-ledge-kink growth mechanism and only single-tilt surface relief combines displacive character. The γ lamellae grow forward by nucleation of growth islands one upon the other and increase length and width by kink migration. The kink density and size control the lateral growth and further determine the lamellar width.",

keywords = "Atomic force microscopy, Intermetallic alloys and compounds, Phase transformation, Surface relief, TiAl",

author = "Xiaolei Li and Jinshan Li and Hongchao Kou and Lin Song and Tiebang Zhang",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2017",

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doi = "10.1016/j.matlet.2016.11.042",

language = "英语",

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pages = "134--137",

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TY - JOUR

T1 - Quantitative study of surface relief produced by formation of lamellar microstructure in a γ-TiAl based alloy

AU - Li, Xiaolei

AU - Li, Jinshan

AU - Kou, Hongchao

AU - Song, Lin

AU - Zhang, Tiebang

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Surface relief produced during lamellar transformation in a Ti48Al2Cr2Nb (at.%) alloy was quantitatively studied. Three-dimensional representations and quantitative data exhibit there are three kinds of surface reliefs, single-tilt, regular-terrace and irregular-strip, corresponding to narrow-width, moderate-width and large-width lamellae, respectively. Observation on fine structure reveals that kinks and ledges of the three kinds of surface reliefs are different. All the surface reliefs are related to diffusional terrace-ledge-kink growth mechanism and only single-tilt surface relief combines displacive character. The γ lamellae grow forward by nucleation of growth islands one upon the other and increase length and width by kink migration. The kink density and size control the lateral growth and further determine the lamellar width.

AB - Surface relief produced during lamellar transformation in a Ti48Al2Cr2Nb (at.%) alloy was quantitatively studied. Three-dimensional representations and quantitative data exhibit there are three kinds of surface reliefs, single-tilt, regular-terrace and irregular-strip, corresponding to narrow-width, moderate-width and large-width lamellae, respectively. Observation on fine structure reveals that kinks and ledges of the three kinds of surface reliefs are different. All the surface reliefs are related to diffusional terrace-ledge-kink growth mechanism and only single-tilt surface relief combines displacive character. The γ lamellae grow forward by nucleation of growth islands one upon the other and increase length and width by kink migration. The kink density and size control the lateral growth and further determine the lamellar width.

KW - Atomic force microscopy

KW - Intermetallic alloys and compounds

KW - Phase transformation

KW - Surface relief

KW - TiAl

UR - http://www.scopus.com/inward/record.url?scp=85006293913&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2016.11.042

DO - 10.1016/j.matlet.2016.11.042

M3 - 文章

AN - SCOPUS:85006293913

SN - 0167-577X

VL - 188

SP - 134

EP - 137

JO - Materials Letters

JF - Materials Letters

ER -

Quantitative study of surface relief produced by formation of lamellar microstructure in a γ-TiAl based alloy

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Keywords

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