Title

Fatigue-resistant high-performance elastocaloric materials made by additive manufacturing

Publication Date

11-29-2019

Department

Ames Laboratory; Aerospace Engineering; Mechanical Engineering; Materials Science and Engineering

Campus Units

Ames Laboratory, Aerospace Engineering, Mechanical Engineering, Materials Science and Engineering

OSTI ID+

1577117

Report Number

IS-J-10073; IS-J-10102

DOI

10.1126/science.aax7616

Journal Title

Science

Volume Number

366

Issue Number

6469

First Page

1116

Last Page

1121

Abstract

Elastocaloric cooling, a solid-state cooling technology, exploits the latent heat released and absorbed by stress-induced phase transformations. Hysteresis associated with transformation, however, is detrimental to efficient energy conversion and functional durability. We have created thermodynamically efficient, low-hysteresis elastocaloric cooling materials by means of additive manufacturing of nickel-titanium. The use of a localized molten environment and near-eutectic mixing of elemental powders has led to the formation of nanocomposite microstructures composed of a nickel-rich intermetallic compound interspersed among a binary alloy matrix. The microstructure allowed extremely small hysteresis in quasi-linear stress-strain behaviors—enhancing the materials efficiency by a factor of four to seven—and repeatable elastocaloric performance over 1 million cycles. Implementing additive manufacturing to elastocaloric cooling materials enables distinct microstructure control of high-performance metallic refrigerants with long fatigue life.

DOE Contract Number(s)

CMMI-1454668; AC02-07CH11358; AR0000131; AC02-06CH11357

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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