中文摘要：

采用高真空电弧熔炼喷射成形法制备Zr47-xCu46Al7Yx（x=3～8）大块非晶合金。采用X射线衍射分析、差示扫描量热仪、扫描电子显微镜、压缩试验和硬度试验分别研究Y含量对合金的非晶形成能力、显微组织、断口形貌及力学性能的影响。结果表明：Y含量对合金系的非晶形成能力和力学性能有显著影响,4 at%～7 at%Y含量试样由完全非晶组织构成,其过冷液相区ΔTx为56～71 K,约化玻璃转变温度Trg为0.665～0.678,但在3 at%与8 at%Y含量试样非晶基体中出现了极少量结晶组织。大块非晶具有较好力学性能,其抗压强度为1803～1899 Mpa,维氏硬度为5.22～5.39 Gpa,且具有较强非晶形成能力的试样相应地具有较好的力学性能。大块非晶在压缩中以纯弹性变形方式发生脆性断裂,断口光滑平整,为典型脉络状花纹。

英文摘要：

Zr47-xCu46Al7Yx（x=3～8） bulk metallic glasses（BMGs） were prepared by injection in copper mould with arc melting.The effects of Y content on the glass-forming ability（GFA）,microstructures,fractured surfaces and mechanical properties of the alloys were investigated by X-ray diffraction（XRD）,differential scanning calorimetry（DSC）,scanning electron microscope（SEM）,compression tests and hardness tests,respectively.Results show that Y content has an evident effect on the GFA and mechanical properties.The BMGs with4at%～7at%Y only contain amorphous phases and possess a larger supercooled liquid region △Tx of 56-71 K and a better reduced glass transition temperature Trg of 0.665-0.678,but very few crystalline phases appear on the BMGs with 3 at%and 8 at%Y contents.The BMGs possess better mechanical properties with compression strength of 1803-1899 MPa and Vickers hardness of 5.22-5.39 GPa,and the BMGs with better GFA correspondingly possess better mechanical properties.In compression test,brittle fracture occurs in the BMGs by pure elastic deformation way,and all fractured surfaces are flat and smooth with typical vein-like morphology.