Zr含量对非晶合金非晶形成能力及力学性能的影响

Effect of Zr Content on Glass-Forming Ability and Mechanical Properties of Bulk Metallic Glasses

采用铜模吸铸法制备出直径为3 mm的[Zr0.72+x(Cu0.59Ni0.41)0.28-x]88Al12(x=0,0.05,0.1)棒状非晶合金。通过X射线衍射(XRD)、差示扫描热量法(DSC)、微机控制电子式万能力学试验机和扫描电镜(SEM)研究其非晶形成能力与压缩力学性能的变化规律。结果表明:随着Zr含量的提高,合金的过冷液相区宽度ΔTx减小,热稳定性下降;约化玻璃转变温度Trg和参数γ均随着Zr含量的提高而下降,非晶形成能力下降;在x=0时,断裂强度、塑性应变和抗压强度均达到最大值,分别为1 531 MPa、14.61%和1 838 MPa;而在x=0.1时,塑性应变和抗压强度则分别达到最小值5.06%和1 495 MPa;试样的室温准静态压缩力学性能随Zr含量的增加而下降。

The [Zr0.72＋x（Cu0.59Ni0.41 ）0.28-x]88Al12（x=0, 0.05, 0.1 ）bulk amorphous alloy rods with 3 mm diameters were prepared by copper mold casting technique, and the effect of Zr content on the glass forming ability （GFA） and mechanical properties of [Zr0.72＋x（Cu0.59Ni0.41）0.28-x]88Al12（x=0, 0.05, 0.1 ） alloys were studied by X-ray diffractometry （XRD）, differential scanning calorimeter （DSC）, compression tests and electron backscatter diffraction （EBSD）. The results show that the supercooled liquid region △Tx, the reduced glass transition temperature Trg and the parameter γ decreases with the increase of Zr content, which results in the decrease of the thermal stability and GFA. The fracture strength, plastic strain and compressive strength reached the maximum value which are 1 531 MPa, 14.61% and 1838MPa when x=0. However, the plastic strain and compressive strength reached the minimum value 5.06% and 1 495 MPa when x=0.1. It is concluded that the quasistatic compressive mechanical properties decreased with the increase of Zr content.