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研究了Zr对Fe-36Ni因瓦合金组织和热塑性的影响及相关作用机制.结果表明:加入质量分数为0.081%Zr处理后,合金中形成了大量高熔点的ZrO2颗粒;错配度计算表明,ZrO2(001)面与合金基体的(001)面之间的错配度仅为0.77%,因此,ZrO2可以作为有效的非均质形核核心,使柱状晶变短变细,等轴晶比例增加,凝固组织得到显著改善.温度低于1050℃时,Fe-36Ni因瓦合金热塑性较差,晶界强度较低及晶界滑移是其主要断裂机制;Zr通过细化晶粒来强化晶界、限制晶界的滑移和促进晶界的迁移,从而显著提高了合金950~1000℃的热塑性;温度高于1050℃,由于动态再结晶的出现,合金展现出了良好的热塑性.
The effect of Zr on the microstructure and thermomechanical properties of Fe-36Ni invar alloy was investigated. The results show that a large amount of high melting point ZrO2 particles are formed in the alloy after the addition of 0.081% Zr. Mismatch calculation shows that, The mismatch between the ZrO2 (001) plane and the (001) plane of the alloy substrate is only 0.77%. Therefore, ZrO2 can act as an effective heterogeneous nucleation site, causing the columnar crystals to become shorter and equiaxed Increase, the solidification organization has been significantly improved.When the temperature is below 1050 ℃, Fe-36Ni Invar alloy thermoplastic poor, low grain boundary strength and grain boundary sliding is the main fracture mechanism; Zr through the grain refinement to strengthen the crystal Which limits the slip of the grain boundaries and promotes the migration of the grain boundaries, thereby significantly improving the thermoplasticity of the alloy at temperatures of 950-1000 ° C. The alloys exhibit good thermoplasticity at temperatures above 1050 ° C. due to the dynamic recrystallization.