Formation and properties of Mg-based metallic glasses in Mg-TM-X alloys (TMCu or Ni; XSn, Si, Ge, Zn, Sb, Bi or In)
✍ Scribed by S.Y. Su; Y. He; G.J. Shiflet; S.J. Poon
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 701 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
Amorphous Mg-TM-X (TM ~Cu or Ni; X-~ Sn, Si, Ge, Zn, Sb, Bi or In) alloys are produced by a single-roller meltspinning technique. It is found that, by varying the quenching speed, the amorphous phases can readily be formed in Mg-TM-Sn alloys and the critical thickness for forming complete amorphous ribbons can be expanded to about 150-200 /~m. Calorimetry studies reveal that the reduced glass temperature Trg in Mg-TM-Sn metallic glasses is about 0.52, which is quite low compared with that of the conventional good glass formers. A fracture tensile strength as high as 900 MPa is recorded for Mg~0NitsSn 5 metallic glass, which is much higher than that of the conventional Mg-based crystalline alloys. Substitution of Sn by Sb, Bi or In in these Mg-based alloys can also result in metallic glass formation; however a high quenching speed is needed and the tensile strengths are much reduced. The glass formability in these Mg-based alloys is discussed within the framework of current metallic glass formation theories.