铝含量对(Zr0.761Cu0.147Ni0.092)93−xAl7+x非晶合金的热稳定性及其力学性能的影响

摘要

(Zr0.761Cu0.147Ni0.092)93?xAl7+xbulk amorphous alloys with x of 0, 1, 2, 3, 5, 7 (mole fraction, %) were prepared by copper mold casting method. The differential scanning calorimeter (DSC), universal testing machine and micro-hardness tester were employed to detect the supercooled liquid region, mechanical properties and microhardness of the samples, respectively. Furthermore, the relationship between microstructures and mechanical properties of the BMGs was analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that, with the addition of the content of Al, the glass transition temperature Tgand initial crystallization temperature Txof (Zr0.761Cu0.147Ni0.092)93?xAl7+x(x=0, 1, 2, 3, 5, 7 (mole fraction, %)) amorphous alloys increase. But the supercooled liquid region ΔTxof amorphous alloys firstly increases and then decreases, and it reaches 94 K which is best in the supercooled liquid region ΔTxof the alloys when x=3. The plastic deformation increases first and then decreases with the Al content increasing and the plastic deformation reaches the highest value of 15.82% while x is 3. Along with the increase of the content of Al, the yield strength σsand microhardness HV of the alloy have an enhanced trend, and both of them reach the highest value of 1713 and 4095 MPa while x is 7.%采用铜模吸铸法制备(Zr0.761Cu0.147Ni0.092)93?xAl7+x(x=0, 1, 2, 3, 5, 7 (摩尔分数, %))块体非晶合金,采用同步示差扫描量热仪(DSC)、万能试验机和显微硬度计测试各试样的过冷液相区、压缩塑性和显微硬度,利用X射线衍射(XRD)和扫描电镜(SEM)等手段对其微观结构和力学性能的关系进行分析.结果表明:随着Al含量的增加, (Zr0.761Cu0.147Ni0.092)93?xAl7+x非晶合金的玻璃转变温度Tg、初始晶化温度Tx均呈现增大的趋势,而过冷液相区ΔTx先增大后减小,在x=3时达到最大的94 K.合金塑性变形εp随着Al含量的增加先增大后减小,在x=3时达到最大值为15.82%;合金屈服强度σs和显微硬度HV都呈现增强的趋势,在x=7时取得最大值,分别为1713和4095 MPa.