Formation, thermal stability and mechanical properties of amorphous alloys in the Mg-transition metal(Ni, Cu)-alkaline-earth metal(Ca, Sr, Ba) system
✍ Scribed by Toshisuke Shibata; Akihisa Inoue; Tsuyoshi Masumoto
- Publisher
- Springer
- Year
- 1993
- Tongue
- English
- Weight
- 409 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0022-2461
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✦ Synopsis
Mg Ni-Ca, Mg-Ni-Sr, Mg-Ni-Ba and Mg-Cu-Ca alloys were found to be amorphized by melt-spinning in the compositional ranges 0to 30% Ni and 0to40% Ca, 5to 20% Ni and 0to 15% Sr,.10 to 25% Ni and 0 to 15% Ba, and 0 to 50% Cu and 0 to 35% Ca, respectively. In the amorphous Mg-Ni-Ca and Mg-Cu-Ca alloys, the glass transition was observed in the ranges of 7.5 to 15% Ni and 2.5 to 5% Ca and 10 to 40% Cu and 2.5 to 7.5% Ca, respectively. The crystallization temperature (Tx) of amorphous Mg Cu Ca alloys increases with increasing Cu content, while 7-, for amorphous Mg-Ni-Ca and Mg-Ni-Sr alloys shows a maximum value of 459 and 471 K, respectively, at 15% Ni. The glass transition temperature (Tg) increases monotonously with increasing Ni or Cu content. Amorphous Mg-Ni-Ca and Mg-Ni-Sr ribbons containing more than 80% Mg have a good bending ductility and the highest tensile fracture strength (~f) reaches 690 and 680 MPa, respectively. _The ratios of of to density are nearly equal to those for previously reported Mg-Ni-(Y or Ln) amorphous alloys with higher of values because of the low densities of the present Mg-based alloys.
* On leave from Yoshida Kogyo K.K., Yoshida Krobe Toyama Pref.