Improving the ductility of high-strength multiphase NiAl alloys by introducing multiscale high-entropy phases and martensitic transformation

Zhu, Yichao; Zhou, Shangcheng; Wang, Liang; Yun, Liang; Xue, Yunfei; Wang, Lu

doi:10.1016/j.msea.2021.140949

Cited by 13 publications

(1 citation statement)

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“…This BCC microstructure with coherent B2 precipitates has been observed in other HEAs containing Al and Ni [25][26][27][28], because the enthalpy formation of the binary Al-Ni is more negative and favors the formation of an Al-Ni intermetallic. The phase stability in alloys is governed by changes in the Gibbs free energy, given by:…”

Section: Resultssupporting

confidence: 65%

Understanding the Links between the Composition-Processing-Properties in New Formulations of HEAs Sintered by SPS

Alvaredo

Molina-Aldareguía

Vaz-Romero

et al. 2021

Metals

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This work presents two new compositions of high entropy alloys (HEAs) that were designed with the aim of obtaining a body-centered cubic (BCC) phase with high hardness values and a moderate density. Sintering was performed using Spark Plasma Sintering (SPS) with different heating rates to determine the influence of the processing parameters on the phase formation. The microstructural study revealed that the presence of Ni in the composition promoted phase separation, and the mechanical study confirmed a clear influence on the mechanical properties of both the composition and heating rate. The combination of microscopy with compression and nanoindentation tests at room and high temperature made it possible to advance our understanding of the relationships between the composition, processing, and properties of this emerging group of alloys.

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Section: Resultssupporting

confidence: 65%