Effect of heat treatment on microstructure and mechanical properties of spark plasma sintered AlCoCrFeNiTi0.5 high entropy alloy
Artikel i vetenskaplig tidskrift, 2016

The present work is focused on synthesis and heat treatment on non-equiatomic AlCoCrFeNiTi0.5 high entropy alloy (HEA) with a composite structure reinforced by TiC nanoparticles. The initial alloy was prepared by mechanical alloying (MA) in a planetary ball mill, compacted by spark plasma sintering (SPS) and heat treated at different temperatures. Mechano-chemical reactions during the MA process as well as the microstructure and hardness of the SPS-ed compacts prior to and after the heat treatment were investigated. During MA, Cr-based supersaturated solid solution with the BCC structure was formed. After SPS at 1100 °C, the BCC solid solution decomposed into nano-grained microstructure consisting of FCC and ordered BCC solid solutions, σ phase, and in-situ formed TiC nanoparticles. The high hardness of the alloy (762 HV) was retained after the subsequent heat treatment at 1100 °C (603 HV). It was shown that the fabrication of TiC reinforced nanocomposites from elemental powders without the use of expensive nanograined powders can be achieved.

Multi-principal-element alloys alloy

HEA

SPS

Composites

Författare

I. Moravcik

Vysoke uceni technicke v Brne

J. Cizek

Vysoke uceni technicke v Brne

P. Gavendova

Vysoke uceni technicke v Brne

Saad Ahmed Sheikh

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Sheng Guo

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

I. Dlouhy

Vysoke uceni technicke v Brne

Materials Letters

0167-577X (ISSN)

Vol. 174 53-56

Ämneskategorier

Kemi

DOI

10.1016/j.matlet.2016.03.077

Mer information

Skapat

2017-10-08