Effects of Alloying Elements on the Thermal Stability and Corrosion Resistance of an Fe-based Metallic Glass with Low Gl
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BULK metallic glasses (BMGs) have been drawing increasing attention because of their unique properties, such as high strength, high hardness, and large elastic strain limit. Especially, the inherent superplastic deformation ability in the supercooled liquid region makes the BMGs capable of being manufactured for microand nanodevices with complex shapes.[1–5] The BMGs suitable for the superplastic processing should simultaneously possess low glass transition temperature (Tg), large supercooled liquid region (DTx = Tx Tg, Tx: crystallization temperature), high glass-forming ability (GFA), good mechanical properties, and excellent corrosion resistance.[5] Some Zr-, Pd-, Au-, and Lanthanides-based BMGs have been proposed as candidates for the superplastic processing materials due to their low Tg, large DTx, and high GFA.[3,4,6,7] However, these BMGs either contain the noble metals or possess poor
YANHUI LI, Lecturer, XINGJIE JIA and XUEWEI WANG, Graduates, and CANFENG FANG, Associate Professor, are with the School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, P.R. China. WEI ZHANG, Professor, is with the School of Materials Science and Engineering, Dalian University of Technology, and also Guest Professor, with Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. Contact e-mail: [email protected] FENGXIANG QIN, Assistant Professor, and SHINICHI YAMAURA and YOSHIHIKO YOKOYAMA, Associate Professors, are with the Institute for Materials Research, Tohoku University. Manuscript submitted April 30, 2013. METALLURGICAL AND MATERIALS TRANSACTIONS A
corrosion resistance in the aggressive media, which limits their practical applications. Since the first Fe-based BMGs were reported in the Fe-(Al, Ga)-(P, C, B) system in 1995,[8] various Fe-based BMGs with high strength and good soft magnetic properties have been developed.[9] Combined with good mechanical and magnetic properties, and low material cost, the ferromagnetic Fe-based BMGs are expected to produce functional magnetic micro- and nanodevices by the superplastic processing. However, the developed Fe-based BMGs usually exhibit high Tg, narrow DTx, and almost no plastic strain at room temperature, which hinder their superplastic formability. It is significant to develop Fe-based BMGs simultaneously possessing low Tg, large DTx, high GFA, and good mechanical properties. In addition, it is important to improve the corrosion resistance of Fe-based BMGs to make them acceptable for use on an industrial level. We have noticed that some Fe-based metallic glasses in Fe-TM-(P, C, B) (TM = transition metals) system present a low Tg together with good mechanical and soft magnetic properties, while they possess a narrow DTx and poor GFA.[10] It is well known that alloying with suitable elements has shown beneficial effects on the GFA, thermal stability, and properties of BMGs.[11,12] It has been reported that some additions of Mo and Cr in the Fe-based BMGs can not only enhance the GFA of the base alloy but also imp
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