Emerging Topics of High-Performance Alloys (2nd Edition)

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: 20 July 2025 | Viewed by 1350

Special Issue Editors


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Guest Editor
Department of Mechatronics Engineering, National Changhua University of Education, Kaohsiung 50007, Taiwan
Interests: shape memory alloys; metallurgy; microstructure; mechanics of materials; mechanical properties; materials processing
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Guest Editor
Department of Mechatronics Engineering, National Changhua University of Education, Kaohsiung 50007, Taiwan
Interests: Internet of Things (IoT); intelligent systems; artificial intelligence (AI); integrated circuit design; opto-electronic materials and devices
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
NASA Glenn Research Center, Cleveland, OH 44135, USA
Interests: high temperature oxidation; alumina scales
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Guest Editor Assistant
Department of Materials Science and Engineering, National Formosa University, 64 Wunhua Road, Huwei, Yunlin 63201, Taiwan
Interests: magnetic materials; perpendicular magnetic aisotropy; exchange bias; thin film deposition; spintronics; perovskite solar cells/dye-sensitized solar cells; composites/biomimetic functional materials; plasma assisted processes

Special Issue Information

Dear Colleagues,

The new Special Issue of Crystals, Emerging Topics of High-Performance Alloys (2nd Edition), continues the previous Issue (https://www.mdpi.com/journal/crystals/special_issues/alloys_topics1).

High-performance alloys such as shape memory, high entropy, and aluminum alloys can be used in different industrial applications. Their properties are required to customize material processing and microstructure. As a result, it is important to investigate how the thermomechanical processing conditions affect the microstructure and property profile of high-performance alloys. This investigation is important for developing and optimizing new alloys for different thermomechanical processing and transfer to industrial processes. Therefore, this Special Issue aims to identify the correlations between thermomechanical processes, microstructure, and mechanical properties of high-performance alloys. Contributions are intended to show the influence of the thermomechanical process, e.g., casting, hot or cold rolling, heat treatment, sintering, and extrusion on the property profile. In addition to experimental approaches, the development methods of modeling and simulation approaches are useful to predict composition–microstructure–property relations for high-performance alloy development and thermomechanical process design. The editors, therefore, welcome all contributions that add knowledge to this scientific field.

We look forward to receiving your submissions.

Dr. Li-Wei Tseng
Prof. Dr. Yeong-Lin Lai
Dr. James Smialek
Guest Editors

Dr. Chau-Yi Tsai
Guest Editor Assistant

Manuscript Submission Information

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Keywords

  • smart materials
  • high-performance alloys
  • shape memory alloys
  • high entropy alloys
  • high-strength aluminum alloys
  • mechanical property
  • microstructure characterization

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Published Papers (1 paper)

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Research

12 pages, 32986 KiB  
Article
Microstructure Control and Hot Cracking Prevention During Laser Additive Manufacturing of Cobalt-Based Superalloy
by Xuanyu Liu, Xianghui Xiao, Wenjia Xiao, Junbin Zeng, Kuanfang He and Hui Xiao
Crystals 2024, 14(12), 1043; https://doi.org/10.3390/cryst14121043 - 30 Nov 2024
Cited by 1 | Viewed by 957
Abstract
Hot cracking is a frequent and severe defect that occurs during laser additive manufacturing of superalloys. In this work, a pulsed-wave (PW) laser modulation process was employed to control the solidification microstructure and reduce the hot cracking susceptibility of laser additive manufactured cobalt-based [...] Read more.
Hot cracking is a frequent and severe defect that occurs during laser additive manufacturing of superalloys. In this work, a pulsed-wave (PW) laser modulation process was employed to control the solidification microstructure and reduce the hot cracking susceptibility of laser additive manufactured cobalt-based superalloy. The effects of continuous-wave (CW) and PW laser processing modes on the dendrite morphology, element segregation, eutectic phase, and hot cracking of fabricated Co-based superalloys were investigated. Optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were used to characterize the microstructural characteristics of samples. A two-color pyrometer was used to measure the molten pool temperature variation under different laser processing modes. The results show that coarse columnar dendrites, chain-like eutectic carbides, and hot cracks were observed in the CW sample. In contrast, the fine equiaxed crystals, discrete eutectic carbides, and low-level residual stresses were obtained to avoid hot cracks, owing to the high cooling rate and the periodic melting and solidification of the molten pool under the PW laser processing mode. This work provides a new method for controlling solidification structure and hot cracking of laser additive manufactured Co-based superalloy. Full article
(This article belongs to the Special Issue Emerging Topics of High-Performance Alloys (2nd Edition))
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