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Powder Processing of Light Alloys and Composites
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Powder Processing of Light Alloys and Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 4950

Special Issue Editor

Dr. Damon Kent

E-Mail Website
Guest Editor
1. School of Science, Technology and Engineering, University of the Sunshine Coast, Maroochydore DC, QLD 4558, Australia
2. Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM), University of Queensland, Brisbane, QLD 4072, Australia
Interests: light metals; powder metallurgy; additive manufacturing; phase transformations; composites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Light alloys and light alloy-based composites are widely employed in applications requiring a high strength-to-weight, energy efficiency, and safety critical performance, including in transport, aerospace, and biomedical applications. Over the past decades, there have been substantial developments in alloy design and processing, leading to improvements in performance and increased usage. Powder-based processing routes, including conventional powder metallurgy and emergent additive manufacturing methods, offer prospects for the economical production of net-shape components with complex or customised designs. There is also substantial opportunity to integrate both ex-situ and in-situ reinforcement toward the fabrication of light alloy-based composites with enhanced properties, including greater strength and better wear resistance. Despite recent advances, ongoing research is required in order to understand and improve important aspects of their processing and structures for better performance and reliability. This Special Issue seeks to provide a current snapshot of the recent advances, as well as highlight ongoing challenges in the powder processing of light alloys and light alloy-based composites, through collecting expert views and article contributions across a broad spectrum, including on powder development, alloy design, processing, microstructure, novel designs, and emerging or advanced applications.

Dr. Damon Kent
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • light alloys
  • composites
  • powder metallurgy
  • additive manufacturing
  • microstructure
  • processing
  • properties
  • design

Published Papers (3 papers)

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Research

11 pages, 3321 KiB  
Article
Study on the Hot Deformation Characterization of Borated Stainless Steel by Hot Isostatic Pressing
by Yanbin Pei, Xuanhui Qu, Qilu Ge and Tiejun Wang
Materials 2021, 14(23), 7110; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14237110 - 23 Nov 2021
Cited by 2 | Viewed by 1102
Abstract
Borated stainless steel (BSS) specimens have a boron content of 1.86 wt%, and are prepared by hot isostatic pressing (HIP) conducted at different temperatures, ranging from 1000 to 1100 °C and a constant true strain rate (0.01, 0.1, 1 and 10 s−1 [...] Read more.
Borated stainless steel (BSS) specimens have a boron content of 1.86 wt%, and are prepared by hot isostatic pressing (HIP) conducted at different temperatures, ranging from 1000 to 1100 °C and a constant true strain rate (0.01, 0.1, 1 and 10 s−1). These tests, with observations and microstructural analysis, have achieved the hot deformation characteristics and mechanisms of BSS. In this research, the activation energy (Q) and Zener–Hollomon parameter (Z) were contrasted against the flow curves: Q = 442.35 kJ/mol. The critical conditions associated with the initiation of dynamic recrystallization (DRX) for BSS were precisely calculated based on the function between the strain hardening rate with the flow stress: at different temperatures from 1000 to 1100 °C: the critical stresses were 146.69–254.77 MPa and the critical strains were 0.022–0.044. The facts show that the boron-containing phase of BSS prevented the onset of DRX, despite the saturated boron in the austenite initiated DRX. The microstructural analysis showed that hot deformation promoted the generation of borides, which differed from the initial microstructure of HIP. The inhomogeneous distribution of elements in the boron-containing phase was caused by hot compression. Full article
(This article belongs to the Special Issue Powder Processing of Light Alloys and Composites)
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10 pages, 3979 KiB  
Article
Effect of Heat Treatment Temperature on Microstructure and Properties of PM Borated Stainless Steel Prepared by Hot Isostatic Pressing
by Yanbin Pei, Xuanhui Qu, Qilu Ge and Tiejun Wang
Materials 2021, 14(16), 4646; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14164646 - 18 Aug 2021
Cited by 2 | Viewed by 1536
Abstract
Borated stainless steel (BSS) with a boron content of 1.86% was prepared by a powder metallurgy process incorporating atomization and hot isostatic pressing. After solution quenching at 900–1200 °C, the phase composition of the alloy was studied by quantitative X-ray diffraction phase analysis. [...] Read more.
Borated stainless steel (BSS) with a boron content of 1.86% was prepared by a powder metallurgy process incorporating atomization and hot isostatic pressing. After solution quenching at 900–1200 °C, the phase composition of the alloy was studied by quantitative X-ray diffraction phase analysis. The microstructure, fracture morphology, and distributions of boron, chromium, and iron in grains of the alloy were analyzed by field-emission scanning electron microscopy with secondary electron and energy-dispersive spectroscopy. After the coupons were heat treated at different temperatures ranging from 900 to 1200 °C, the strength and plasticity were tested, and the fracture surfaces were analyzed. Undergoing heat treatment at different temperatures, the phases of the alloy were austenite and Fe1.1Cr0.9B0.9 phase. Since the diffusion coefficients of Cr, Fe, and B varied at different temperatures, the distribution of elements in the alloy was not uniform. The alloy with good strength and plasticity can be obtained when the heat treatment temperature of alloy ranged from 1000 to 1150 °C while the tensile strength was about 800 MPa, with the elongation standing about 20%. Full article
(This article belongs to the Special Issue Powder Processing of Light Alloys and Composites)
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10 pages, 1673 KiB  
Article
Nucleation Behavior of a Single Al-20Si Particle Rapidly Solidified in a Fast Scanning Calorimeter
by Qin Peng, Bin Yang, Benjamin Milkereit, Dongmei Liu, Armin Springer, Markus Rettenmayr, Christoph Schick and Olaf Keßler
Materials 2021, 14(11), 2920; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14112920 - 28 May 2021
Cited by 4 | Viewed by 1663
Abstract
Understanding the rapid solidification behavior characteristics, nucleation undercooling, and nucleation mechanism is important for modifying the microstructures and properties of metal alloys. In order to investigate the rapid solidification behavior in-situ, accurate measurements of nucleation undercooling and cooling rate are required in most [...] Read more.
Understanding the rapid solidification behavior characteristics, nucleation undercooling, and nucleation mechanism is important for modifying the microstructures and properties of metal alloys. In order to investigate the rapid solidification behavior in-situ, accurate measurements of nucleation undercooling and cooling rate are required in most rapid solidification processes, e.g., in additive manufacturing (AM). In this study, differential fast scanning calorimetry (DFSC) was applied to investigate the nucleation kinetics in a single micro-sized Al-20Si (mass%) particle under a controlled cooling rate of 5000 K/s. The nucleation rates of primary Si and secondary α-Al phases were calculated by a statistical analysis of 300 identical melting/solidification experiments. Applying a model based on the classical nucleation theory (CNT) together with available thermodynamic data, two different heterogeneous nucleation mechanisms of primary Si and secondary α-Al were proposed, i.e., surface heterogeneous nucleation for primary Si and interface heterogenous nucleation for secondary α-Al. The present study introduces a practical method for a detailed investigation of rapid solidification behavior of metal particles to distinguish surface and interface nucleation. Full article
(This article belongs to the Special Issue Powder Processing of Light Alloys and Composites)
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