Effect of low temperature on tensile properties of AlCoCrFeNi2.1 eutectic high entropy alloy
Artikel i vetenskaplig tidskrift, 2018

The effect of low temperature on tensile properties of a AlCoCrFeNi 2.1 eutectic high entropy alloy (EHEA) was investigated in the present work. Transmission electron microscopy (TEM) showed that the initial as-cast microstructure consisted of B2 (ordered body centered cubic structure) and L1 2 (ordered face centered cubic structure) phases. Upon tensile testing at temperatures ranging from room temperature (RT) to −196 °C (77 K), the L1 2 phase became disordered, changing to a simple FCC (face centered cubic) crystal structure whereas the B2 phase maintained an ordered structure. An increase over 300 MPa was observed in the ultimate tensile strength (σ UTS ) of the −196 °C tensile tested sample compared to the room temperature tensile tested sample, while keeping almost similar amount of total elongation. TEM results indicated an increase in the dislocation activity in the FCC phase as well as B2 phase in the −196 °C tensile tested sample compared to the sample deformed at room temperature.

Low temperature tensile test

TEM

Nanoindentation

Eutectic high entropy alloy

Författare

T. Bhattacharjee

Kyoto University

Ruixiao Zheng

Kyoto University

Yan Chong

Kyoto University

Saad Ahmed Sheikh

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Sheng Guo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

I. T. Clark

Scienta Omicron

T. Okawa

Scienta Omicron

I. S. Wani

IIT Hyderabad

P. P. Bhattacharjee

IIT Hyderabad

Akinobu Shibata

Kyoto University

N. Tsuji

Kyoto University

Materials Chemistry and Physics

0254-0584 (ISSN)

Vol. 210 207-212

Ämneskategorier

Keramteknik

Annan materialteknik

Metallurgi och metalliska material

DOI

10.1016/j.matchemphys.2017.06.023

Mer information

Senast uppdaterat

2018-03-28