Accession Number:

AD1099979

Title:

Nanostructured High Entropy Alloys

Descriptive Note:

[Technical Report, Final Report]

Corporate Author:

University of California - Davis

Personal Author(s):

• Lavernia, Enrique J.

Report Date:

2016-08-25

Pagination or Media Count:

22

Abstract:

The objective of this research program was to establish a fundamental framework that can be used to advance our knowledge of nanostructured high entropy alloy HEA materials and their processing, microstructure and performance. This program was conducted via a synergistic approach involving materials synthesis and processing, microstructural and mechanical behavior studies. Through the performance period September 10, 2014 July 31, 2016, the following studies were conducted 1 A medium entropy alloy AlCoNiFe was selected for systematic studies of Ti additions and the influence of materials processingsynthesis on microstructural evolution and mechanical behavior. 2 An AlNiFeCrCo HEA was investigated to understand the influence of Co and materials processingsynthesis techniques on microstructural evolution and mechanical behavior. 3 An equiatomic CoNiFeAlTi HEA was synthesized and the effect of high atomic concentration of Ti and Al on the microstructure, phase transformations and mechanical behavior was studied. 4 Phase transformations, microstructure and strengthening mechanisms in a near-equiatomic CoNiFeAlCu HEA were investigated. 5 The influence of Cr on alloying behavior, microstructure and mechanical behavior of an AlTiCoNiFeCr HEA was studied. 6 Fabrication of ingot AlCoCrCuFeNi HEA was carried out. 7 High pressure torsion processing of AlCoCrCuFeNi HEA was applied to investigate the effects of grain refinement on mechanical behavior of HEAs. 8 Synthesis and processing of nanocrystalline AlCoCrCuFeNi HEA via gas atomization, cryomilling and spark plasma sintering SPS was explored. 9 Investigation of microstructure and mechanical behavior of a precipitation-hardened Fe27Ni27Co26Cu10Ti10 HEA. 10 Thermal stability and mechanical behavior of a single phased Fe27Ni27Co26Cu10Mn10 HEA.

Descriptors:

• materials science
• materials
• materials processing
• mechanical working
• phase transformations
• diffraction
• stress strain relations
• crystal structure
• high pressure
• mechanical properties
• stresses
• yield strength
• chemical analysis
• engineering
• grain size
• hardness
• materials engineering
• plastic deformation
• powder metallurgy
• scattering

Subject Categories:

• Properties of Metals and Alloys
• Fabrication Metallurgy
• Mechanics

Distribution Statement:

[A, Approved For Public Release]