Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy

Tsai Fu Chung; Yo Lun Yang; Bo Ming Huang; Zhusheng Shi; Jianguo Lin; Takahito Ohmura; Jer Ren Yang

doi:10.1016/j.actamat.2018.02.045

Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy

Tsai Fu Chung
, Yo Lun Yang (Corresponding Author)
, Bo Ming Huang
, Zhusheng Shi
, Jianguo Lin
, Takahito Ohmura
, Jer Ren Yang (Corresponding Author)

Research output: Journal article publication › Journal article › Academic research › peer-review

288 Citations (Scopus)

Abstract

High resolution transmission electron microscopy (HRTEM) with nanometer-scaled energy-dispersive X-ray (EDX) was employed to investigate the transformation mechanisms of the GP zone → η′ → η precipitation sequence of AA7050, an Al-Zn-Mg-Cu alloy. Serial in-situ HRTEM frames revealed that separated nucleation of an η′ precipitate occurred elsewhere as the adjacent GPII zone dissolved. Evidence from HRTEM coupled with EDX showed that in-situ nucleation of a new η₂ precipitate (one form of η) took place, wherein it gradually developed from the original η′ precipitate via a similar hexagonal structure with different compositions. The in-situ transition product was composed of two distinctive regions; one was identified as η′ and the other, as η.

Original language	English
Pages (from-to)	377-387
Number of pages	11
Journal	Acta Materialia
Volume	149
DOIs	https://doi.org/10.1016/j.actamat.2018.02.045
Publication status	Published - 1 May 2018
Externally published	Yes

Keywords

Aluminium alloy
Energy-dispersive X-ray
High resolution transmission electron microscopy
In-situ nucleation
Separated nucleation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

More information

10.1016/j.actamat.2018.02.045

Cite this

@article{791a0ee7745f462c959f612b2dc2e0d0,

title = "Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy",

abstract = "High resolution transmission electron microscopy (HRTEM) with nanometer-scaled energy-dispersive X-ray (EDX) was employed to investigate the transformation mechanisms of the GP zone → η′ → η precipitation sequence of AA7050, an Al-Zn-Mg-Cu alloy. Serial in-situ HRTEM frames revealed that separated nucleation of an η′ precipitate occurred elsewhere as the adjacent GPII zone dissolved. Evidence from HRTEM coupled with EDX showed that in-situ nucleation of a new η2 precipitate (one form of η) took place, wherein it gradually developed from the original η′ precipitate via a similar hexagonal structure with different compositions. The in-situ transition product was composed of two distinctive regions; one was identified as η′ and the other, as η.",

keywords = "Aluminium alloy, Energy-dispersive X-ray, High resolution transmission electron microscopy, In-situ nucleation, Separated nucleation",

author = "Chung, \{Tsai Fu\} and Yang, \{Yo Lun\} and Huang, \{Bo Ming\} and Zhusheng Shi and Jianguo Lin and Takahito Ohmura and Yang, \{Jer Ren\}",

note = "Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2018",

month = may,

day = "1",

doi = "10.1016/j.actamat.2018.02.045",

language = "English",

volume = "149",

pages = "377--387",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Acta Materialia Inc",

}

TY - JOUR

T1 - Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy

AU - Chung, Tsai Fu

AU - Yang, Yo Lun

AU - Huang, Bo Ming

AU - Shi, Zhusheng

AU - Lin, Jianguo

AU - Ohmura, Takahito

AU - Yang, Jer Ren

PY - 2018/5/1

Y1 - 2018/5/1

N2 - High resolution transmission electron microscopy (HRTEM) with nanometer-scaled energy-dispersive X-ray (EDX) was employed to investigate the transformation mechanisms of the GP zone → η′ → η precipitation sequence of AA7050, an Al-Zn-Mg-Cu alloy. Serial in-situ HRTEM frames revealed that separated nucleation of an η′ precipitate occurred elsewhere as the adjacent GPII zone dissolved. Evidence from HRTEM coupled with EDX showed that in-situ nucleation of a new η2 precipitate (one form of η) took place, wherein it gradually developed from the original η′ precipitate via a similar hexagonal structure with different compositions. The in-situ transition product was composed of two distinctive regions; one was identified as η′ and the other, as η.

AB - High resolution transmission electron microscopy (HRTEM) with nanometer-scaled energy-dispersive X-ray (EDX) was employed to investigate the transformation mechanisms of the GP zone → η′ → η precipitation sequence of AA7050, an Al-Zn-Mg-Cu alloy. Serial in-situ HRTEM frames revealed that separated nucleation of an η′ precipitate occurred elsewhere as the adjacent GPII zone dissolved. Evidence from HRTEM coupled with EDX showed that in-situ nucleation of a new η2 precipitate (one form of η) took place, wherein it gradually developed from the original η′ precipitate via a similar hexagonal structure with different compositions. The in-situ transition product was composed of two distinctive regions; one was identified as η′ and the other, as η.

KW - Aluminium alloy

KW - Energy-dispersive X-ray

KW - High resolution transmission electron microscopy

KW - In-situ nucleation

KW - Separated nucleation

UR - https://www.scopus.com/pages/publications/85043397382

U2 - 10.1016/j.actamat.2018.02.045

DO - 10.1016/j.actamat.2018.02.045

M3 - Journal article

AN - SCOPUS:85043397382

SN - 1359-6454

VL - 149

SP - 377

EP - 387

JO - Acta Materialia

JF - Acta Materialia

ER -

Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy

Abstract

Keywords

ASJC Scopus subject areas

More information

Other files and links

Fingerprint

Cite this