Effects of Ultrasound on Microstructure and Mechanical Properties of Metal Composite Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (31 July 2022) | Viewed by 2773

Special Issue Editor


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Guest Editor
School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China
Interests: solidification; casting; ultrasound; Al/Mg alloys and their composites; nuclear shielding materials
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Special Issue Information

Dear Colleagues,

Metal composite materials (MCMs) have become evident as a significant class of materials for structural and functional applications, such as in the automobile, aerospace, and military industries. It is well known that the microstructures of MCMs directly influence their mechanical properties. Microstructural control has been paid increasing attention in the fabrication or modification of MCMs. Ultrasound has been widely used in organic synthesis, material and organometallic chemistry, and industrial manufacturing processes, for the intensification of chemical/physical processing applications which can be promoted significantly in ultrasonic fields. Searching for new approaches in MCM fabrication by using ultrasound to improve conventional methods and develop new means of melting, casting, solidification, welding, and deforming  processes (other methods are also included) are issues of critical importance for the development of MCMs.

In this Special Issue, we aim to publish a wide scope of articles covering the usage of ultrasound in the fabrication of MCMs, focusing on the effects of ultrasound on the microstructure and mechanical properties of MCMs. In the meantime, papers regarding the simulation of ultrasound in the preparation of MCMs are also welcome.

Prof. Dr. Zhiwei Liu
Guest Editor

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Keywords

  • Metal composite materials
  • Ultrasound
  • Casting
  • Solidification
  • Welding
  • Deforming
  • Simulation
  • Microstructure
  • Mechanical properties

Published Papers (1 paper)

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Research

20 pages, 53619 KiB  
Article
Correlation between Laser-Ultrasound and Microstructural Properties of Laser Melting Deposited Ti6Al4V/B4C Composites
by Wanwei Xu, Xue Bai, Zhonggang Sun, Xin Meng and Zhongming Guo
Metals 2021, 11(12), 1951; https://doi.org/10.3390/met11121951 - 03 Dec 2021
Cited by 5 | Viewed by 2164
Abstract
The presence of large microtextured clusters (MTC) composed of small α-phase crystallites with preferred crystallographic orientations in 3D printed near-α titanium alloys leads to poor mechanical and fatigue properties. It is therefore crucial to characterize the size of MTCs nondestructively. Ti6Al4V/B4C [...] Read more.
The presence of large microtextured clusters (MTC) composed of small α-phase crystallites with preferred crystallographic orientations in 3D printed near-α titanium alloys leads to poor mechanical and fatigue properties. It is therefore crucial to characterize the size of MTCs nondestructively. Ti6Al4V/B4C composite materials are manufactured using Laser Melting Deposition (LMD) technology by adding an amount of nano-sized B4C particles to the original Ti6Al4V powder. TiB and TiC reinforcements precipitating at grain boundaries stimulate the elongated α crystallites and coarse columnar MTCs to equiaxed transition, and microstructures composed of approximately equiaxed MTCs with different mean sizes of 11–50 μm are obtained. Theoretical models for scattering-induced attenuation and centroid frequency downshift of ultrasonic waves propagating in such a polycrystalline medium are presented. It is indicated that, the studied composite material has an extremely narrow crystallographic orientation distribution width, i.e., a strong degree of anisotropy in MTCs. Therefore, MTCs make a dominant contribution to the total scattering-induced attenuation and spectral centroid frequency downshift, while the contribution of fine α-phase crystallites is insignificant. Laser ultrasonic inspection is performed, and the correlation between laser-generated ultrasonic wave properties and microstructural properties of the Ti6Al4V/B4C composites is analyzed. Results have shown that the deviation between the experimentally measured ultrasonic velocity and the theoretical result determined by the Voigt-averaged velocity in each crystallite is no more than 2.23%, which is in good agreement with the degree of macroscopically anisotropy in the composite specimens. The ultrasonic velocity seems to be insensitive to the size of MTCs, while the spectral centroid frequency downshift is approximately linear to the mean size of MTCs with a goodness-of-fit (R2) up to 0.99. Actually, for a macroscopically untextured near-α titanium alloy with a relatively narrow crystallographic orientation distribution, the ultrasonic velocity is not correlated with the properties of MTCs, by contrast, the central frequency downshift is dominated by the size and morphology of MTCs, showing great potentials in grain size evaluation. Full article
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