Multiple precipitation pathways in an Al-7Si-0.6Mg alloy fabricated by selective laser melting

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The ageing responses of selective laser melted Al-7Si-0.6Mg alloy with different solid solution treatment times are investigated in this work. Silicon particles with random crystallographic orientations are the dominant precipitates at the direct aged condition. With 1 or 8 h solid solution treatment, the precipitation sequence resembles that of cast/wrought Al-Si-Mg alloys. However, the main precipitates at the peak-aged condition are different and are premature B′ (1 h) and β″ (8 h), respectively. These unusual precipitation pathways are attributed to the uniaxial strains in the Al matrix, suggesting new heat treatment procedures required for selective laser melted alloys.

LanguageEnglish
Pages66-69
Number of pages4
JournalScripta Materialia
Volume160
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • Al alloys
  • Precipitation
  • Residual stress
  • Selective laser melting
  • TEM

Cite this

@article{5d1de10802884bdfb552f295cdfdeed4,
title = "Multiple precipitation pathways in an Al-7Si-0.6Mg alloy fabricated by selective laser melting",
abstract = "The ageing responses of selective laser melted Al-7Si-0.6Mg alloy with different solid solution treatment times are investigated in this work. Silicon particles with random crystallographic orientations are the dominant precipitates at the direct aged condition. With 1 or 8 h solid solution treatment, the precipitation sequence resembles that of cast/wrought Al-Si-Mg alloys. However, the main precipitates at the peak-aged condition are different and are premature B′ (1 h) and β″ (8 h), respectively. These unusual precipitation pathways are attributed to the uniaxial strains in the Al matrix, suggesting new heat treatment procedures required for selective laser melted alloys.",
keywords = "Al alloys, Precipitation, Residual stress, Selective laser melting, TEM",
author = "Rao, {Jeremy H.} and Yong Zhang and Kai Zhang and Aijun Huang and Davies, {Chris H. J.} and Xinhua Wu",
year = "2019",
month = "2",
day = "1",
doi = "10.1016/j.scriptamat.2018.09.045",
language = "English",
volume = "160",
pages = "66--69",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier",

}

Multiple precipitation pathways in an Al-7Si-0.6Mg alloy fabricated by selective laser melting. / Rao, Jeremy H.; Zhang, Yong; Zhang, Kai; Huang, Aijun; Davies, Chris H. J.; Wu, Xinhua.

In: Scripta Materialia, Vol. 160, 01.02.2019, p. 66-69.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Multiple precipitation pathways in an Al-7Si-0.6Mg alloy fabricated by selective laser melting

AU - Rao, Jeremy H.

AU - Zhang, Yong

AU - Zhang, Kai

AU - Huang, Aijun

AU - Davies, Chris H. J.

AU - Wu, Xinhua

PY - 2019/2/1

Y1 - 2019/2/1

N2 - The ageing responses of selective laser melted Al-7Si-0.6Mg alloy with different solid solution treatment times are investigated in this work. Silicon particles with random crystallographic orientations are the dominant precipitates at the direct aged condition. With 1 or 8 h solid solution treatment, the precipitation sequence resembles that of cast/wrought Al-Si-Mg alloys. However, the main precipitates at the peak-aged condition are different and are premature B′ (1 h) and β″ (8 h), respectively. These unusual precipitation pathways are attributed to the uniaxial strains in the Al matrix, suggesting new heat treatment procedures required for selective laser melted alloys.

AB - The ageing responses of selective laser melted Al-7Si-0.6Mg alloy with different solid solution treatment times are investigated in this work. Silicon particles with random crystallographic orientations are the dominant precipitates at the direct aged condition. With 1 or 8 h solid solution treatment, the precipitation sequence resembles that of cast/wrought Al-Si-Mg alloys. However, the main precipitates at the peak-aged condition are different and are premature B′ (1 h) and β″ (8 h), respectively. These unusual precipitation pathways are attributed to the uniaxial strains in the Al matrix, suggesting new heat treatment procedures required for selective laser melted alloys.

KW - Al alloys

KW - Precipitation

KW - Residual stress

KW - Selective laser melting

KW - TEM

UR - http://www.scopus.com/inward/record.url?scp=85054177777&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2018.09.045

DO - 10.1016/j.scriptamat.2018.09.045

M3 - Article

VL - 160

SP - 66

EP - 69

JO - Scripta Materialia

T2 - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

ER -