Effects of zr additions on structure and microhardness evolution of eutectic al-6ni alloy

Chanun Suwanpreecha*, Phromphong Pandee, Ussadawut Patakham, David C. Dunand, Chaowalit Limmaneevichitr

*Corresponding author for this work

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

1 Scopus citations

Abstract

Dilute Al-Zr alloys form upon aging, Al3Zr nano-precipitates which resist coarsening up to 475 °C. Binary eutectic Al-Ni alloys exhibit Al3Ni microfibers formed during solidification which also have good thermal stability. Here, we combine both strengthening approaches and study the effects of Zr micro-additions to an eutectic Al-6Ni (wt%) alloy on macro-, microstructure and hardness evolution upon long-term aging at 350 and 375 °C. The Al-6Ni-0.2Zr and Al-6Ni-0.4Zr (wt%) alloys exhibit a dendritic microstructure with primary Al3Zr micro-precipitates. The Al-6Ni alloy maintains a constant room-temperature hardness after aging at 350 and 375 °C for 432 and 96 h, respectively, followed by a slow softening due to coarsening of the Al3Ni microfibers. The Al-6Ni-0.4Zr alloy shows a strong precipitation-hardening response from Al3Zr nano-precipitates achieving peak hardness after 48 and 24 h upon aging at 350 and 375 °C, respectively, and maintaining peak hardness for 768 and 264 h after aging at these temperatures. However, no precipitation hardening is occurring in Al-6Ni-0.2Zr, due to the lower Zr amount present in the matrix after solidification.

Original languageEnglish (US)
Title of host publicationLight Metals, 2019
EditorsCorleen Chesonis
PublisherSpringer International Publishing
Pages373-377
Number of pages5
ISBN (Print)9783030058630
DOIs
StatePublished - 2019
EventLight Metals Symposium held at the TMS Annual Meeting and Exhibition, 2019 - San Antonio, United States
Duration: Mar 10 2019Mar 14 2019

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceLight Metals Symposium held at the TMS Annual Meeting and Exhibition, 2019
Country/TerritoryUnited States
CitySan Antonio
Period3/10/193/14/19

Keywords

  • Aging
  • Al-Ni-Zr alloy
  • Microfibers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Effects of zr additions on structure and microhardness evolution of eutectic al-6ni alloy'. Together they form a unique fingerprint.

Cite this