Next Article in Journal
Strain Hardening Behavior and Microstructure Evolution of High-Manganese Steel Subjected to Interrupted Tensile Tests
Next Article in Special Issue
Mechanical Properties of ARMCO® Iron after Large and Severe Plastic Deformation—Application Potential for Precursors to Ultrafine Grained Microstructures
Previous Article in Journal
Recent Advances in Study of Solid-Liquid Interfaces and Solidification of Metals
Previous Article in Special Issue
Alkaline Metal Reagent-Assisted Synthesis of Monodisperse Iron Oxide Nanostructures
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessFeature PaperArticle

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

1
Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
2
Advanced Materials & Processing Center, Institute for Advanced Engineering, Yongin 17180, Korea
3
The 4th Research and Development, Agency for Defense Development, Daejeon 34060, Korea
4
Department of Materials Science and Engineering, Ajou University, Suwon 16499, Korea
*
Author to whom correspondence should be addressed.
Metals 2018, 8(2), 121; https://doi.org/10.3390/met8020121
Received: 31 December 2017 / Revised: 5 February 2018 / Accepted: 7 February 2018 / Published: 9 February 2018
(This article belongs to the Special Issue Synthesis and Properties of Bulk Nanostructured Metallic Materials)
  |  
PDF [4016 KB, uploaded 9 February 2018]
  |  

Abstract

The Al-Ni system is known as a high energy density materials (HEDM) because of its highly exothermic nature during intermetallic compound (IMC) formation. In this study, elemental Al and Ni powder were milled to explore the effect of cryomilling atmosphere on the microstructure and exothermic behavior. Scanning electron microscope (SEM) observations show continuous structural refinement up to 8 h of cryomilling. No IMC phase was detected in the X-ray diffraction (XRD) spectrum. Differential thermal analyzer (DTA) results show two exothermic peaks for 8 h cryomilled powder as compared to that of powder milled for 1 h. The ignition temperature of prepared powder mixture also decreased due to gradual structural refinement. The activation energy was also calculated and correlated with the DTA and SEM results. The cryomilled Al-Ni powder is composed of fine Al-Ni metastable junctions which improve the reactivity at a lower exothermic reaction temperature. View Full-Text
Keywords: high energy density materials; Al-Ni; cryomilling; exothermic reaction; activation energy high energy density materials; Al-Ni; cryomilling; exothermic reaction; activation energy
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Oh, M.; Oh, M.C.; Han, D.; Jung, S.-H.; Ahn, B. Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling. Metals 2018, 8, 121.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top