https://dc.engconfintl.org/cgi/viewcontent.cgi?article=1032&context=superalloys_ii

A critical review of high entropy alloys and related concepts

High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

https://www.tandfonline.com/doi/pdf/10.1080/21663831.2014.912690

High-Entropy Alloys: A Critical Review

Prediction of high-entropy stabilized solid-solution in multi-component alloys

Microstructure and Room Temperature Properties of a High-Entropy TaNbHfZrTi Alloy (Postprint)

Microstructure and wear behavior of AlxCo1.5CrFeNi1.5Tiy high-entropy alloys

An AlCrFeCoNi high entropy alloy was prepared by vacuum arc melting. Only diffraction peak corresponding to a BCC crystal structure is observed for this AlCrFeCoNi high entropy alloy. The microstructure of this AlCrFeCoNi alloy is polygonal grains with intragranular dendritic segregation. Dendritic segregation area is found to be Al, Ni rich and Cr, Fe deplete, while interdendritic segregation area is Cr, Fe rich and Al, Ni deplete. The distribution of Co is essentially identical. The fine microstructure of dendritic segregation area and of interdendritic segregation area is found to be nanoscale spherical precipitates morphology and basket-weave morphology, respectively. Results of EDS attached on high resolution scanning electron microscope (SEM) revealed that these morphological characteristics are also resulted from elements segregation. This AlCrFeCoNi high entropy alloy exhibits excellent compressive properties. The yield stress, compressive strength and plastic strain of the alloy reaches 1250.96, 2004.23 MPa, and 32.7%, respectively. The fracture mechanism of this AlCrFeCoNi high entropy alloy is observed as cleavage fracture and slip separation.

Microstructure and compressive properties of AlCrFeCoNi high entropy alloy

Mn, Ti and V were added in an equal-molar ratio to the AlCrFeCoNiCu alloy and the effects of these added elements on microstructure and properties of AlCrFeCoNiCu high entropy alloy were studied. The results indicate that the AlCrFeCoNiCuMn alloy shows almost the same microstructure as in AlCrFeCoNiCu alloy except for a long-strip Cr-enriched phase. The additions of Ti change the AlCrFeCoNiCu alloy from a dendrite structure to eutectic-cell one. Hence two phases in the eutectic cells are detected as one Al, Ti, Co, Ni enriched phase and another Cr, Fe enriched phase. V added alloy is also a dendrite structure, but V additions change the morphology of dendritic area from modulated plates to ellipsoidal particles. The addition of V into the AlCrFeCoNiCu alloy shows the best strengthening effect and the lowest decrease in the ultimate strain in our experiments.

Effects of Mn, Ti and V on the microstructure and properties of AlCrFeCoNiCu high entropy alloy

Effect of interfacial microstructure on the thermal-mechanical properties of mesophase pitch-based carbon fiber reinforced aluminum composites

Effect of Gd content on interfacial microstructures and mechanical properties of Cf/Mg composite

In this study, the rare earth element Y was added to C f /Mg composite to improve the interfacial bonding strength 60 vol% C f /Mg composites containing different Y content were fabricated by pressure infiltration method An interfacial layer with nano-scale formed between C f and Mg–Y alloys The interfacial products were identified to be MgO, Mg 2 Y and Mg 24 Y 5 by energy dispersive X-ray spectroscopy (EDX) and selected area electron diffraction (SAED) Moreover, the interfacial products enhanced the interface bonding strength, which could be confirmed by the increase of interlaminar shear strength (ILSS) In particular, the C f /Mg composite with 57 wt% Y addition increases the ILSS by about 1209% from 462 MPa to 1023 MPa

Yaping Wang

Papers

Microstructure and compressive properties of AlCrFeCoNi high entropy alloy

Effects of Mn, Ti and V on the microstructure and properties of AlCrFeCoNiCu high entropy alloy

Effect of interfacial microstructure on the thermal-mechanical properties of mesophase pitch-based carbon fiber reinforced aluminum composites

Effect of Gd content on interfacial microstructures and mechanical properties of Cf/Mg composite

Effect of Y content on interfacial microstructures and mechanical properties of Cf/Mg composite