Formation, thermal stability and mechanical properties of Cu-Zr and Cu-Hf binary glassy alloy rods
Formation, thermal stability and mechanical properties of Cu-Zr and Cu-Hf binary glassy alloy rods
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DOI：
10.2320/matertrans.45.584
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发表时间：
2004-02-01
影响因子：
1.2
通讯作者：
Zhang, W
中科院分区：
文献类型：
--
作者：
Inoue, A;Zhang, W
用铜模铸造法在Cu-Zr和Cu-Hf二元合金系中制备了直径达1.5 μ m的非晶合金棒，该合金棒在晶化前具有较大的过冷液相区和较高的机械强度。在Zr含量为30 ~ 70原子%，Hf含量为35 ~ 60原子%的范围内，获得了超过40 K的大的过冷液相区。由玻璃化转变温度（T-g）和结晶温度（T-x）之间的差Δ T（x）（= T-x - T-g）定义的过冷液相区的最大值对于Cu 60 Zr 40为58 K，对于Cu 55 Hf 45为59 K。两种合金的约化玻璃转变温度（T-g/T-l）分别为0.61和0.59。在50 K以上具有大Δ T（x）的合金通过铜模铸造形成直径达1.5 mm的大块玻璃合金形式。Cu 60 Zr 40、Cu 45 Zr 55、Cu 60 Hf 40和Cu 55 Hf 45非晶合金棒具有高的断裂强度，分别为1920、1880、2245和2260 MPa，杨氏模量分别为107、102、120和121 GPa，弹性延伸率约为1.9%，塑性延伸率高达2.2%。这些二元玻璃态合金棒的形成可以解释的概念的框架下，形成的独特的玻璃结构主要由二十面体原子配置为类似于特殊的多组分合金的三个组件的规则。
Glassy alloy rods with diameters up to 1.5 rum exhibiting a large supercooled liquid region before crystallization and high mechanical strength were formed in Cu-Zr and Cu-Hf binary alloy systems by the copper mold casting method. The large supercooled liquid region exceeding 40 K was obtained in the composition range of 30 to 70 at%Zr and 35 to 60 at%Hf. The largest value of the supercooled liquid region defined by the difference between glass transition temperature (T-g) and crystallization temperature (T-x), DeltaT(x) (= T-x - T-g), was 58 K for Cu60Zr40 and 59 K for Cu55Hf45. The reduced glass transition temperature (T-g/T-l) of the two alloys was 0.61 and 0.59, respectively. The alloys with large DeltaT(x) above 50 K were formed into a bulk glassy alloy form with diameters up to 1.5 mm by copper mold casting. The Cu60Zr40, Cu45Zr55, Cu60Hf40 and Cu55Hf45 glassy alloy rods exhibited high fracture strength of 1920, 1880, 2245 and 2260 MPa, respectively, Young's modulus of 107, 102, 120 and 121 GPa, respectively, a nearly constant elastic elongation of about 1.9% and plastic elongation up to 2.2%. The formation of these binary glassy alloy rods can be interpreted in the framework of the concept of the formation of the unique glassy structure consisting mainly of icosahedral atomic configuration as similar to that for special multi-component alloys with the three component rules.