New bulk glassy alloys were formed in the Ca–Mg–Cu system by the copper mold casting method. The maximum rod diameter (
dmax) for the formation of a glassy phase was 2 mm for Ca
67Mg
19Cu
14 and above 4 mm for Ca
57Mg
19Cu
24. The glass transition temperature (
Tg), crystallization temperature (
Tx), supercooled liquid region (
ΔTx=
Tx−
Tg) and reduced glass transition temperature (
Tg⁄
Tm) are 387 K, 407 K, 20 K and 0.60, respectively, for the former alloy and 404 K, 440 K, 36 K and 0.64, respectively, for the latter alloy. There is a tendency for
dmax to increase with increasing
ΔTx and
Tg⁄
Tm. Young’s modulus (
E) and compressive fracture strength are 38 GPa and 545 MPa, respectively, for the Ca
57Mg
19Cu
24 alloy rod with a diameter of 2 mm. The success of synthesizing bulk glassy alloys in the simple metal (Ca) base system makes it important as a basic alloy system for examining fundamental chemical and physical properties of bulk glassy alloys.
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