合金元素对非晶形成能力及力学性能的影响

Role of alloying additions in glass-formation ability and mechanical behavior of Fe-based metallic glasses

采用铜模吸铸法制备了直径为Φ4mm的合金Fe55Ni2Cr12Mo10B6C13Y2,Fe55Cu2Cr12Mo10B6C13Y2和Fe55Nb2Cr12Mo10B6C13Y2。通过X射线衍射(XRD),差式扫描量热法(DSC)以及压缩实验研究了Ni,Cu和Nb合金元素对Fe55Ni2Cr12Mo10B6C13Y2,Fe55Cu2Cr12Mo10B6C13Y2和Fe55Nb2Cr12Mo10B6C13Y2合金的非晶形成能力和力学性能的影响。实验结果表明:Fe55Ni2Cr12Mo10B6C13Y2和Fe55Cu2Cr12Mo10B6C13Y2可以形成块体非晶,他们的约化玻璃转化温度Trg为0.57。非晶合金Fe55Ni2Cr12Mo10B6C13Y2和Fe55Cu2Cr12Mo10B6C13Y2具有较高的压缩断裂强度。Fe55Cu2Cr12Mo10B6C13Y2的断裂方式不是沿剪切带断裂,而是断裂成很多碎片。Fe55Ni2Cr12Mo10B6C13Y2断裂时这两种方式共同存在。

Fe55 Ni2 Cr12 Mi10 B5 C13 Y2, Fe55 Cu2 Cr12 Mo10 B6 C13 Y2 and Fe55 Nb2 Cr12 Mo10 B6 Cl3 Y2 alloys with diameter of 4mm were produced by copper mold casting in this paper. The role of alloying additions （Ni, Cu or Nb） on glass-forming ability and mechanical behavior of Fe55 Nb2 Cr12 Mo10 B6 C13 Y2, Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 and Fe6 Cu2 Cr12 Mo10 B6 C13 Y2 alloys were studied by X-ray diffractometer, differentials canning calorimeter and compression testing. The experiment results show that Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 and Fe55 Cu2 Cr13 Mo10 B6 C13 Y2 alloys can be cast into bulk metallic glasses and their reduced glass transition temperature Trg is about 0.57. Amorphous alloys Fe55 Ni2 Cr12 Mo10B6 C13 Y2 and Fe55 Cu2 Cr12 Mo10 B6 C13 exhibit high fracture strength after compression. The fracture behavior of Fe55 Cu2 Cr12 Mo10 B6 C13 Y2 is not shear fracture mechanism along a shear plane, but breaking of sample into many small parts. The fracture of Fe55 Ni2 Cr12 Mo10 B6 C13 Y2 alloy occurs both the shear mode and break mode.