Entropy | Free Full-Text | Physical Properties of High Entropy Alloys

Introduction 

High entropy alloys (HEAs) are a novel class of metallic material with a distinct design strategy [1,2]. Different from conventional alloys that are typically designed based on one or two principal
elements, HEAs are composed of more than five principal elements. It has been reported that
HEAs possess many attractive properties, such as high hardness [3–7], outstanding wear resistance [8,9], good fatigue resistance characteristics [10], excellent high-temperature strength [11,12], good
thermal stability [13] and, in general, good oxidation [8] and corrosion resistance [14,15]. These
properties suggest great potential in a wide variety of applications. Thus, HEAs have received
significant attention in recent years. Up till now, more than 300 HEAs have been developed,
forming a new frontier of metallic materials. Most studies on HEAs are focused on the
relationships between phase, microstructure, and mechanical properties. Although less attention
was paid to the physical properties of HEAs, they are actually also quite encouraging. This paper
briefly reviews current understanding of the physical properties of HEAs, with emphasis on the
magnetic, electrical, and thermal properties

Examples of magnetic properties:

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Electrical & Thermal Conductivity

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Entropy | Free Full-Text | Physical Properties of High Entropy Alloys

IT IS rocket science - air-breathing rocket engine for plane and space trave

According to Prof.Ken Naitoh of Waseda University   six major challenges lie in the range of scales from nano to tera: 
(I) modern fluid dynamics of turbulence; 
(II) non-equilibrium macroscopic quantum mechanics;
(III) onto-biology; 
(IV) bacteria application for environmental and medical problems; 
(V) hypersonic and automotive engines; and (VI) economic models.
(VI) economic models.
Number 5 in theis list is: Hypersonic and automotive engines. 

Six major challenges lie in the range of scales from nano to tera: (I) modern fluid dynamics of turbulence; (II) non-equilibrium macroscopic quantum mechanics; (III) onto-biology; (IV) bacteria application for environmental and medical problems; (V) hypersonic and automotive engines; and (VI) economic models.
Ultimate goals are the exploration of life in the cosmos using spacecraft with our proposed new aerospace engine and finding potential answers to the question "What is life?”

REF:
It is rocket science - air-breathing rocket engine for plane and space travel | IOM3: The Global Network for Materials, Minerals & Mining Professionals

Full Article on The 6 Major Challenges

Sabre rocket reaction engine l