不同直径的Zr_(60.3)Ni_(16.2)Cu_(13.5)Al_(10)块体非晶合金的力学性能

Mechanical Properties of Different Diameters Zr_(60.3)Ni_(16.2)Cu_(13.5)Al_(10) Bulk Amorphous Alloy

采用铜模吸铸法制备了阶梯型的Zr60.3Ni16.2Cu13.5Al10非晶合金,利用X射线衍射(XRD)分别对直径为3 mm、4 mm、6 mm的合金试样进行结构分析,利用万能试验机及扫描电镜对试样进行压缩试验和断口形貌分析。研究表明,由于冷却速度的影响,直径为3 mm时是非晶结构,直径为4mm和6 mm时是中心晶体和表面非晶体混合结构;对于Zr60.3Ni16.2Cu13.5Al10合金,直径为3 mm时断裂强度可达到1775 Mpa,塑性变形可达到2.02%,而直径为4 mm的非晶复合材料的塑性变形可达2.93%,适当体积的晶体相的加入可以有效的提高非晶材料的塑性。

The step samples of Zr60.3Ni16.2Cu13.5Al10 amorphous alloy are prepared by suction casting into the copper mold, which diameters are 3 mm,6mm and 4 mm respectively. The structural characteristics is measured by X-ray diffraction （XRD）. Compression tests are conducted on the cylindrical specimens at room temperature by universal testing machine. The fracture morphology of the strained sample is examined by scanning electron microscopy （SEM）. The results show that because the cooling rate has a great influence on the microstructure of Zr60.3Ni16.2Cu13.5Al10 alloy, the alloy as the diameter 3 mm is amorphous, and the alloy as diameter 4 mm and 6 mm are crystal in core and amorphous at surface. Their fracture strength is 1775 MPa and plastic deformation up to 2.02% as diameter 3 mm, and the plastic deformation of amorphous composites is 2.93% as the diameter 4 mm. So the plasticity of amorphous materials can effectively improve when join in the appropriate volume of the crystalline phase.