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Metals
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High-Performance Powder Metallurgy Structural Materials
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High-Performance Powder Metallurgy Structural Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Powder Metallurgy".

Deadline for manuscript submissions: 25 October 2024 | Viewed by 2937

Special Issue Editor

Prof. Dr. Bohua Duan

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Interests: powder metallurgy; porous material; microwave sintering; plastic process; biomaterial

Special Issue Information

Dear Colleagues,

Compared with casting, plastic processes and other manufacturing technologies, powder metallurgy，as a near-net-shape forming technology, can not only produce structural parts more economically and efficiently but also achieve high dimensional accuracy and performance requirements. This advantage has been driving the development of powder metallurgy technology. With the global requirements for reducing carbon emissions and growing application needs in modern automotive, aerospace and other fields, developing novel powder metallurgy material solutions with higher dimensional accuracy, higher performance and cost-effectiveness is both urgent and necessary. For this reason, various new materials for powder metallurgy are constantly and innovatively designed, such as high-entropy alloys, electronic packaging materials, composite materials and new tool steels, while a series of new powder metallurgy technologies has been constantly exploited, such as warm compaction, powder injection molding, spark-plasma-activated sintering, microwave sintering, laser selective sintering, microwave-hot pressing sintering, ultrahigh pressure sintering, oscillating pressure sintering, etc. All these render powder metallurgy techniques with greater development opportunities and improved application prospects.

In this Special Issue, we welcome articles that focus on the development and application of new processes or new materials about powder metallurgy, as well as studies on the essential relation between powder metallurgy processes and the microstructure and mechanical properties of materials and products. We think that you could make an excellent contribution to this Special Issue.

Prof. Dr. Bohua Duan
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. Metals is an international peer-reviewed open access monthly 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

  • powder metallurgy
  • sintering
  • microstructure
  • mechanical properties
  • steel
  • powder injection molding

Published Papers (3 papers)

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Research

13 pages, 14039 KiB  
Article
Effect of Copper Content on the Microstructure and Properties of the Sintered Porous Aluminum Wick
by Yanbo Cai and Bohua Duan
Metals 2024, 14(4), 386; https://doi.org/10.3390/met14040386 - 26 Mar 2024
Viewed by 637
Abstract
Porous aluminum has been widely used as a wick, an electrode, and in other products, due to its advantages of a light weight, pore uniformity, and corrosion resistance. However, the dense alumina layer on the surface of Al powder hinders its densification during [...] Read more.
Porous aluminum has been widely used as a wick, an electrode, and in other products, due to its advantages of a light weight, pore uniformity, and corrosion resistance. However, the dense alumina layer on the surface of Al powder hinders its densification during sintering. In this paper, porous aluminum was prepared via loose powder sintering with the addition of Cu as a sintering aid. The effects of Cu content on the microstructure and wick properties of the porous aluminum were investigated. The results showed that, with increasing Cu content, the porosity and capillary properties of porous Al decreased, while the compressive strength improved. The optimal Cu content was determined to be 3 wt.% and the prepared porous Al has a porosity of 47.5%, plateau stress of 11.82 MPa, and capillary characteristic parameter of 6.72 × 10−8 N, meeting the requirements for wicks in heat pipes. These findings contribute to the demand for the lightweight design of heat pipes for aerospace applications. Full article
(This article belongs to the Special Issue High-Performance Powder Metallurgy Structural Materials)
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12 pages, 6554 KiB  
Article
Study on High-Temperature Low-Cycle Fatigue Behavior of the FGH96 Superalloy Based on Internal Stress Division
by Zhengguang Li, Haiqin Qin, Kejun Xu, Zhenbo Xie, Pengcheng Ji and Mingming Jia
Metals 2023, 13(10), 1705; https://doi.org/10.3390/met13101705 - 7 Oct 2023
Viewed by 703
Abstract
In order to deeply explore the high-temperature cyclic characteristics of the FGH96 superalloy under different strain amplitudes, the high-temperature low-cycle fatigue behavior of the FGH96 superalloy was analyzed from the perspective of internal stress evolution. Four sets of strain amplitude (0.5%, 0.6%, 0.8%, [...] Read more.
In order to deeply explore the high-temperature cyclic characteristics of the FGH96 superalloy under different strain amplitudes, the high-temperature low-cycle fatigue behavior of the FGH96 superalloy was analyzed from the perspective of internal stress evolution. Four sets of strain amplitude (0.5%, 0.6%, 0.8%, and 1.2%) controlled high-temperature low-cycle fatigue tests were carried out on the FGH96 superalloy at 550 °C, and the internal stress was divided into back stress and effective stress through the cyclic stress-strain curves. The results show that the cyclic softening/hardening characteristics of the FGH96 superalloy under different strain amplitudes are closely related to the evolution of internal stress. The strain amplitude has a significant effect on the back stress of the FGH96 superalloy but has little effect on effective stress. At low strain amplitudes (0.5% and 0.6%), the back stress evolution rate of the FGH96 superalloy is lower than effective stress, and the material mainly exhibits cyclic softening. At high strain amplitudes (0.8% and 1.2%), the back stress evolution rate of the FGH96 superalloy is significantly higher than effective stress, and the material exhibits cyclic hardening. The combined effect of back stress and effective stress is the main reason for the different low-cycle fatigue behaviors of the FGH96 superalloy under different strain amplitudes. Full article
(This article belongs to the Special Issue High-Performance Powder Metallurgy Structural Materials)
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18 pages, 4277 KiB  
Article
Smoothed Particle Hydrodynamics Approach for Simulation of Non-Newtonian Flow of Feedstocks Used in Powder Injection Molding
by Saleh Meiabadi, Vincent Demers and Louis Dufresne
Metals 2023, 13(9), 1580; https://doi.org/10.3390/met13091580 - 10 Sep 2023
Viewed by 1264
Abstract
The present work aims to explore the ability to simulate flow patterns and the velocity field in the powder injection molding (PIM) process using the smoothed particle hydrodynamics (SPH) method. Numerical simulations were performed using the DualSPHysics platform. A feedstock formulated from 17-4 [...] Read more.
The present work aims to explore the ability to simulate flow patterns and the velocity field in the powder injection molding (PIM) process using the smoothed particle hydrodynamics (SPH) method. Numerical simulations were performed using the DualSPHysics platform. A feedstock formulated from 17-4 PH stainless steel powder (60 vol. % of powder) and a wax-based binder system was prepared to experimentally obtain its rheological properties that were implemented in DualSPHysics using two different viscosity models. The numerical simulations were calibrated, and then validated with real-scale injections using a laboratory injection press. During the calibration step, the feedstock flow momentum equation in the DualSPHysics code was modified and boundary friction coefficients at different injection rates were adjusted to create a frictional effect. During the validation step, these calibrated conditions were used to simulate the flow behavior into a more complex shape, which was compared with experimental measurements. Using an appropriate boundary friction factor, both the frictional effect of the boundaries and the stability of the numerical solution were taken into account to successfully demonstrate the ability of this meshless SPH method. The flow front length and feedstock velocity obtained in a complex cavity were satisfactorily predicted with relative differences of less than 15%. Full article
(This article belongs to the Special Issue High-Performance Powder Metallurgy Structural Materials)
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