Corrosion Behavior of Ti-Based In Situ Dendrite-Reinforced Metallic Glass Matrix Composites in Various Solutions
- PDF / 999,033 Bytes
- 5 Pages / 593.972 x 792 pts Page_size
- 15 Downloads / 239 Views
I.
INTRODUCTION
BULK metallic glasses (BMGs) have attracted a lot of attentions in scientific communities since 1977, due to their superior mechanical performance at room temperatures, such as high strength, large elastic strain limit, and excellent corrosion resistance.[1,2] However, poor tensile ductility and toughness of BMGs, which was mainly stemming from shear localization upon loading,[3] inhibited its structural engineering applications. To address the plasticity issue of BMGs, the so-called in situ dendrite-reinforced metallic glass matrix composites (MGMCs) have been established by several groups,[4,5] which have been developed by in situ introduction of secondary phases, such as particles, fibers, and skeletons. Significant plastic deformation improvement was achieved under compression as well as under tensile mode for several metallic glass composites with ductile bcc phases formed in situ during casting.[3,4] With the ever increasing number of the new BMGs systems and very recent fast-growing understanding of the mechanism regarding their excellent mechanical properties, the application prospect of these amorphous alloys as practical engineering materials has been more promising.[6,7] Since very few reports about the corrosion properties of BMGs in various environments have been reported,[8,9] it is desirable for the study in this F. YANG and H.F. TIAN, Graduate Students, A.D. LAN, Associate Professor, and H.F. ZHOU, B.C. WANG, and J.W. QIAO, Professors, are with the Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China. Contact e-mails: [email protected], [email protected] H.J. YANG, Lecturer, is with the Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, and also with the Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology. Manuscript submitted May 9, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS A
field. Lately, our group reported the fabrication of new Ti-based MGMCs which contain ~41 vol pct of large dendrites, exhibiting excellent tensile strength of ~1650 MPa and a tensile strain of ~2.5 pct at room temperature.[10] However, with its outstanding mechanical properties, the corrosion resistance of these Ti-based in situ MGMCs is still unknown. In this study, we report both the electrochemical and chemical corrosion tests on these Ti-based in situ MGMCs. Generally, the BMGs show superior corrosion resistance in comparison to their crystalline counterparts, which can be attributed to the homogeny of the structure down to the nanometer scale, i.e., the absence of segregation and grain boundaries. It would be interesting to see the corrosion behavior of these composites materials with crystalline dendrites and amorphous matrix coexisting. In this study, the electrochemical corrosion behaviors of Ti40Zr24V12Cu5Be19 in situ dendrite-reinforced MGMCs were investiga
Data Loading...
