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Thermal stability and crystallization kinetics of Mg–Cu–Y–B quaternary alloys

✍ Scribed by Y.T. Cheng; T.H. Hung; J.C. Huang; P.J. Hsieh; J.S.C. Jang

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
618 KB
Volume
449-451
Category
Article
ISSN
0921-5093

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✦ Synopsis

The thermal stability and crystallization kinetics of the Mg 65 Cu 25 Y 10 and Mg 65 Cu 25-x Y 10 B x (numbers indicate at.%, x = 1-10) amorphous alloys are examined and compared in terms of non-isothermal and isothermal differential scanning calorimetry measurements. It is demonstrated that, with the minor addition of 1-5 at.% B, the incubation time for crystallization is prolonged and the activation energy is increased, suggesting an improvement of the thermal stability. Nevertheless, the overall nucleation and growth characteristics of the parent and B-additive alloys are similar. The minor B element appears to impose resistance to the crystallization of the major Mg 2 Cu phase, possibly by blocking the path of Mg and Cu diffusion. With further addition of B upto 10 at.%, secondary crystallization phases such as MgB 4 or YB would be induced and thus lower the thermal stability.

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