铒元素对锆基合金的非晶形成能力及力学性能的影响

Effect of Er on Amorphous Forming Ability and Mechanical Properties of Zr-based Alloys

摘要:

以海绵锆为原料，采用水冷铜坩埚熔炼和铜模吸铸法制备了直径为3 mm、成分为(Zr_0.55Cu_0.3Al_0.1Ni_0.05)_100-xEr_x (x=0，0.5，1，2，3，4，5)的锆基块体合金，通过对比不同铒含量海绵锆基合金的组织结构与性能，研究了铒元素对其非晶形成能力、热稳定性和力学性能的影响。结果表明：以海绵锆为原料时，锆基合金的非晶形成能力和力学性能明显下降。x=0时，无法制备成锆基非晶合金；添加Er元素后，海绵锆基合金的非晶形成能力和力学性能显著提高，具有非晶态结构；x=2时，海绵锆基非晶合金的力学性能最优，抗压强度σ_bc为2142.5 MPa，室温下塑性应变ε_p为10.01%。与高纯锆制备的同直径(Zr_0.55Cu_0.3Al_0.1Ni_0.05)₉₈Er₂非晶合金相比，其抗压强度恢复97.63%，室温塑性恢复69.95%。添加铒元素有利于改善和提高海绵锆基合金的非晶形成能力和力学性能，为低成本制备锆基非晶合金提供一种新思路。

Abstract:

The (Zr_0.55Cu_0.3Al_0.1Ni_0.05)_100-xEr_x (x=0, 0.5, 1, 2, 3, 4, 5) Zr-based bulk alloy with diameter of 3 mm was prepared by water-cooled copper crucible smelting and copper mold suction casting using zirconium sponge as raw material. By comparing the microstructure and mechanical properties of sponge Zr-based alloy with different Er contents, the influence of Er on the amorphous forming ability, thermal stability, and mechanical properties of Zr-based bulk alloy was studied. Results show that when the zirconium sponge is used as the raw material, the amorphous formation ability and mechanical properties of sponge Zr-based alloy are obviously reduced. The sponge Zr-based amorphous alloy cannot be prepared when x=0. After adding Er element, the amorphous forming ability and mechanical properties of the sponge Zr-based alloy with the amorphous structure are improved obviously. The optimal mechanical properties of the sponge Zr-based alloy are achieved when x=2: the compression strength σ_bc is 2142.5 MPa and the plastic strain ε_p is 10.01% at room temperature. Compared with the amorphous (Zr_0.55Cu_0.3Al_0.1Ni_0.05)₉₈Er₂ alloy with the diameter of 3 mm prepared from high-purity Zr, the compressive strength and plasticity at room temperature of the sponge Zr-based alloy recovers by 97.63% and 69.95%, respectively. The Er addition is beneficial to improve the amorphous forming ability and mechanical properties of sponge Zr-based alloy, which also provides a new approach for low-cost preparation of Zr-based amorphous alloy.