Glass-forming ability and mechanical properties of Cu50Zr50−xTix alloys
Glass-forming ability and mechanical properties of Cu50Zr50−xTix alloys
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DOI：
10.1016/j.msea.2005.08.207
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发表时间：
2005-11
期刊：
影响因子：
6.4
通讯作者：
H. Men;S. Pang;T. Zhang
中科院分区：
文献类型：
--
作者：
H. Men;S. Pang;T. Zhang
Cu 50 Zr 50 −xTix（x=0- 50 at.%）的玻璃形成能力（GFA）合金的熔体旋涂和铜模铸造方法进行了研究。在0-15 at. %和35- 45 at.%的成分范围内，可以形成大块金属玻璃Ti. x=7.5和40的合金在局部成分附近显示出最好的GFA，并且玻璃形成的临界直径分别为5和3 mm。x=20-30合金的GFA降低是由于在Cu-Zr-Ti图的中心部分出现Mg_2Zn型Laves相。Cu_（50）Zr_（42.5）Ti_（7.5）合金的过冷液相温度区和约化玻璃转变温度分别为40 K和0.587; Cu_（50）Zr_（10）Ti_（40）合金的过冷液相温度区和约化玻璃转变温度分别为44 K和0.556。这些玻璃态合金具有很高的压缩断裂强度。Cu50Zr42.5Ti7.5和Cu 50 Zr 10 Ti40合金的断裂强度和塑性应变分别为1798 MPa和1.0%，断裂前塑性应变分别为1810 MPa和1.5%。
Glass-forming ability (GFA) of Cu50Zr50−xTix(x=0–50at.%) alloys was investigated by melt-spinning and copper mould casting methods. Bulk metallic glasses can be formed in the composition range of 0–15 and 35–45at.% Ti. The x=7.5 and 40 alloys show the best GFA in the local compositional vicinity, and critical diameters for glass formation is 5 and 3mm, respectively. The GFA of the x=20–30 alloys was degraded due to appearance of a Mg2Zn-type Laves phase in the center portion of Cu–Zr–Ti diagram. The supercooled liquid temperature region and reduced glass transition temperature are 40K, 0.587, respectively, for Cu50Zr42.5Ti7.5, and 44K, 0.556, respectively, for Cu50Zr10Ti40. These glassy alloys exhibit the high compressive fracture strength. The fracture strength and plastic strain before failure are 1798MPa, 1.0%, respectively, for Cu50Zr42.5Ti7.5, and 1810MPa, 1.5%, respectively, for Cu50Zr10Ti40.