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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Effects of additional Ag on the thermal stability and glass-forming ability of La-Al-Cu bulk glassy alloys
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Effects of additional Ag on the thermal stability and glass-forming ability of La-Al-Cu bulk glassy alloys

机译：Ag对La-Al-Cu块状玻璃合金热稳定性和玻璃形成能力的影响

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摘要

The addition of Ag to La-Al-Cu ternary glassy alloys greatly increases the stabilization of supercooled liquid and glass-forming ability (GFA). The large supercooled liquid region (ΔT_x) exceeding 60 K was obtained in a wide composition range of 10-22.5 at.% Al, 15-25 at.% Cu, and 2-12.5 at.% Ag. The largest ΔT_x of 83 K and the reduced glass transition temperature (T_g/7_l) were obtained for La_(62.5)Al_(12.5)Ag_5Cu_(20) alloy, leading to formation of the glassy alloy sample with a diameter of 6.0 mm. The addition of small amounts of Fe or Co to La-Al-Ag-Cu alloy increases T_g/T_l though the decrease in T_l, resulting in an increase of GFA. As a result, the glassy alloy rods with diameters of over 7.0 mm were fabricated by addition of 2.5-5 at.% Fe or Co. The new La-based bulk glassy alloys exhibited high compressive fracture strength of 589-858 MPa with distinct plastic strain of 0.2-1.0%.
机译：向La-Al-Cu三元玻璃态合金中添加Ag大大提高了过冷液体和玻璃形成能力（GFA）的稳定性。在10-22.5原子％的铝，15-25原子％的铜和2-12.5原子％的银的宽组成范围内，获得了超过60 K的大的过冷液体区域（ΔT_x）。对于La_（62.5）Al_（12.5）Ag_5Cu_（20）合金，获得了83 K的最大ΔT_x和降低的玻璃化转变温度（T_g / 7_1），从而形成了直径为6.0 mm的玻璃态合金样品。尽管T_1降低，但是向La-Al-Ag-Cu合金中添加少量Fe或Co会提高T_g / T_1，从而导致GFA增加。结果，通过添加2.5-5 at。％Fe或Co来制造直径超过7.0 mm的玻璃态合金棒。新型La基块状玻璃态合金表现出589-858 MPa的高抗压断裂强度，并具有独特的塑性应变为0.2-1.0％。

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