Metal-Matrix Composites: Analysis, Modeling, Observations and Interpretations: Processing - Microstructure - Performance
Sponsored by: TMS Structural Materials Division, TMS: Composite Materials Committee
Program Organizers: Srivatsan Tirumalai; Yuzheng Zhang, Gamma Alloys; William Harrigan, Gamma Alloys
Monday 2:30 PM
February 24, 2020
Room: 31A
Location: San Diego Convention Ctr
Session Chair: Ramasis Goswami, Naval Research Laboratory
2:30 PM Invited
Role of Matrix Microstructure on the Mechanical Behavior and Corrosion Response of Two Magnesium Metal Matrix Composites: Jayalakshmi S1; Arvind Singh R1; Xizhang Chen1; Sergey Konovalov2; Srivatsan T.S.3; Seshan Sambasivam4; Manoj Gupta5; 1Wenzhou University; 2Samara National Research University; 3The University of Akron; 4Indian Institute of Science; 5National University of Singapore
In this presentation, the results of a study on two popular magnesium cast alloys, viz., the Mg-Al-Mn alloy (AM100) and the Mg-Zn-Cu alloy (ZC63) reinforced with saffil alumina short fiber using the squeeze infiltration technique will be highlighted. The unreinforced base alloys and the composites were investigated for their microstructure, mechanical properties and corrosion resistance. The results reveal the mechanical behavior of the Mg-MMCs to be dependent upon nature of the base matrix and microstructural phases present. Under salt spray corrosion condition, distribution of microstructural phases influences the corrosion resistance of the matrix. The behavior of composites also depends on fiber volume fraction. Composites of the two alloys reveal an improvement in strength when compared to the unreinforced counterpart, while under impact loading and corrosion, the composites had reduced properties. The inherent nature of alloy matrix on mechanical properties and corrosion behavior of magnesium metal matrix composites will be highlighted.
3:00 PM
Simultaneously Applied Electromagnetic and Mechanical Ultrasound for Particle Dispersion in Liquid Metals: Imants Kaldre1; Andris Bojarevics1; 1University of Latvia
It is known that acoustic cavitation is one of the mechanisms for small particle dispersion in metal alloys. In our previous work we analyzed contactless electromagnetic method to disperse particles by superimposed AC and DC magnetic fields. Also use of pulsed magnetic field was tested experimentally. Promising results were obtained in lab scale for some metal/particle pairs like Al/SiC and FeCr/TiN.In this work we present the investigation of electromagnetic ultrasound combined by mechanical ultrasound. Such combined method allows to achieve strong ultrasound and simultaneously significant stirring of the melt. This could be an alternative to two stage process where particle doped initial sample is prepared by stirring or powder metallurgy, which is then melted and treated with ultrasound to disperse individual particles.
3:25 PM
Investigation of Friction Stir Spot Welding of Aluminium Alloys using Zinc as an Interlayer: Pragya Rai1; Sushanta Panda1; Jinu Paul1; 1IIT Kharagpur
The present work focussed on the role of zinc (Zn) interlayer in enhancing the mechanical performance of friction stir spot weld (FSSW) of AA8011-H24 sheets material. The FSSW weld was fabricated successfully with and without interlayer using tool rotational speed, plunge depth, and dwell time of 2600 rpm, 0.2 mm, and 10 s respectively. Moreover, the mechanical performance of spot weld with and without interlayer was evaluated by lap shear test. After the lap shear test, different failure modes of weld nugget were observed through scanning electron microscope (SEM) fractographs. It was found that the lap shear failure load as well as percent elongation increased significantly by ~86% and ~90% respectively using zinc as an interlayer. The welds zones were characterized by metallographic examination, X-ray diffraction, and SEM. Microstructure evolution due to the presence of zinc interlayer was analyzed to get insight into the improvement of mechanical performance.
3:50 PM
Effect of Reinforced Materials Size on Wear Behavior of Cu/B4C Metal Matrix Composites Fabricated by Friction Stir Processing: Jae-Ha Kim1; Hyun-Joon Park1; Choong-Jae Lee1; Jinho Joo1; Seung-Boo Jung1; 1Sungkyunkwan University
Friction stir processing (FSP) has many advantages for refining microstructures, reducing materials damages (low distortion, low stress etc.), and good mechanical properties, also it has been known as zero consumable process. The FSP has been recently studied for fabricating metal matrix composites (MMCs), because of less environmental problem compared with other process. Among the MMCs fabricated by FSP, abrasion resistance materials could apply for various industries that demand abrasion resistance surfaces. Hence, the effect of B4C powder size on microstructures of Cu/B4C MMCs was analyzed in this study. And then the effect of B4C powder size on wear behavior was evaluated.