|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||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
|On-Site Speaker (Planned)
Dilute Al-Zr alloys exhibit, upon aging, Al3Zr nano-precipitates which resist coarsening up to 475 °C. Binary eutectic Al-Ni alloys with Al3Ni microfibers formed during solidification 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 at 350 °C 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. Al-6Ni-0.4Zr shows a strong precipitation-hardening response, achieving peak hardness after aging after 48 and 24 h at 350 and 375 °C, respectively, and maintains peak hardness for to 768 and 264 h after aging at these temperatures. However, no precipitation hardening is visible in Al-6Ni-0.2Zr, due to its lower Zr content.
||Planned: Light Metals