Investigation of phosphorus-containing compounds in aluminum alloys with emphasis on the formation mechanism

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

It is well known that the presence of phosphorus in hypoeutectic Al-Si alloys causes coarsening of Al-Si eutectic even when the phosphorus concentration is as low as a few ppm. The reason is that phosphorus reacts with aluminum to form AlP, the particles of which serve as potential nuclei for silicon due to a very similar lattice parameter with Si. The purpose of this study is to investigate the possibilities for reducing the nucleation potency of AlP by changing the alloy chemistry. The experiments include melting and solidification of a number of aluminum alloys under different conditions. After that, the samples are examined using SEM and TEM microscopy to elucidate the presence of phosphorus-containing compounds and to explain their formation mechanism. The experimentally obtained data are discussed on a systematic basis of thermodynamic calculations and compared with the corresponding data from the relevant literature. Particularly, the results reveal that such elements as Mg, Ca and Sr are potentially capable of neutralizing the nucleation activity of AlP although their effect is dependent on the presence of other chemical elements in the aluminum alloy.

Original languageEnglish
Title of host publicationThe 15th International Conference on Aluminium Alloys, ICAA
EditorsQing Liu, Robert Sanders, Zhihong Jia, Lingfei Cao, Jian-Feng Nie, Jian-Feng Nie
PublisherTrans Tech Publications Ltd
Pages132-138
Number of pages7
ISBN (Print)9783035710502
DOIs
Publication statusPublished - 2017 Jan 1
Event15th International Conference on Aluminium Alloys, ICAA 2016 - Chongqing, China
Duration: 2016 Jun 122016 Jun 16

Publication series

NameMaterials Science Forum
Volume877
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other15th International Conference on Aluminium Alloys, ICAA 2016
CountryChina
CityChongqing
Period16/6/1216/6/16

Keywords

  • Al-Si hypoeutectic alloy
  • AlP nucleating potency
  • Calcium
  • Deactivation
  • Eutectic coarsening
  • Magnesium
  • Strontium

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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