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Manufacturing Bulk Nanocrystalline Al-3Mg Components Using Cryomilling and Spark Plasma Sintering

Journal Article · · Nanomaterials
DOI:https://doi.org/10.3390/nano12203618· OSTI ID:1893182

In the current study, pure aluminum (Al) powders were cryomilled with and without 3 wt.% pure magnesium (Mg) dopant for varying durations followed by spark plasma sintering (SPS) of powders to prepare bulk components with superior mechanical properties. The crystallite sizes were determined for powders and the bulk components by analyzing the X-ray diffraction (XRD) spectrum. The calculations indicated a reduction in crystallite size with the increase in the cryomilling duration. The results also showed a more significant decrease in the crystallite sizes for Al-3Mg samples than that of pure Al. The changes in the surface morphology of powders were characterized using scanning electron microscopy (SEM). The elemental mapping analysis at nanoscale was carried out using Energy-dispersive X-ray spectroscopy (EDX) in Scanning transmission electron microscopy (STEM). The mechanical properties of the bulk components were assessed using a Vickers Microhardness tester. The test results demonstrated an improvement in the hardness of Mg-doped components. Higher hardness values were also reported with an increase in the cryomilling duration. This article discusses the mechanisms for the reduction in crystallite size for pure Al and Al-3Mg and its subsequent impact on improving mechanical properties.

Research Organization:
Univ. of Nevada, Reno, NV (United States); Universitu of Nevada, Reno, NV (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0009116
OSTI ID:
1893182
Alternate ID(s):
OSTI ID: 2418757
OSTI ID: 2473709
Journal Information:
Nanomaterials, Journal Name: Nanomaterials Journal Issue: 20 Vol. 12; ISSN 2079-4991; ISSN NANOKO
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Switzerland
Language:
English

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