氧含量对Ti-35Nb-3.7Zr-1.3Mo-xO合金组织与力学性能的影响

发布时间：2018-05-14 04:11

本文选题：氧元素 + β钛合金　；参考：《东南大学学报(自然科学版)》2015年03期

【摘要】：根据d电子设计理论设计了新型亚稳β合金Ti-35Nb-3.7Zr-1.3Mo-x O,研究了氧含量对该合金组织与力学性能的影响.实验结果表明,合金经固溶后主要为β相,其晶粒尺寸随氧含量提高而细化.低氧合金中存在少量α″相,氧元素对水淬α″相的形成具有抑制作用.冷轧后组织仍主要为β相,但因大变形后缺陷增多而结晶度降低.不同氧含量的合金冷轧后分别出现细针α″相、板条状ω相、锯齿孪晶以及应力诱发α″相等特殊组织.冷轧态Ti-35Nb-3.7Zr-1.3Mo-x O合金的抗拉强度、弹性模量和硬度均随氧含量的提高而升高,但塑性变差.氧含量升高0.1%,则抗拉强度增加约100 MPa;氧含量升高0.3%,则维氏硬度升高约为50;弹性模量处于45~75 GPa之间.在氧含量超过0.6%以后,合金塑性明显变差.
[Abstract]:A new metastable 尾 alloy Ti-35Nb-3.7Zr-1.3Mo-x O was designed based on d electron design theory. The effect of oxygen content on the microstructure and mechanical properties of the alloy was studied. The results show that the alloy is mainly 尾 phase after solid solution, and its grain size is refined with the increase of oxygen content. There is a small amount of 伪 "phase in low oxygen alloy, and oxygen element can inhibit the formation of 伪" phase in water quenching. After cold rolling, the microstructure is mainly 尾 phase, but the crystallinity decreases due to the increase of defects after large deformation. After cold rolling of alloys with different oxygen content, fine needle 伪 "phase, strip 蠅 phase, sawtooth twin and stress-induced 伪" are found respectively. The tensile strength, elastic modulus and hardness of cold-rolled Ti-35Nb-3.7Zr-1.3Mo-x O alloy increased with the increase of oxygen content, but the plasticity became worse. When oxygen content increases 0.1, tensile strength increases about 100MPa, oxygen content increases 0.3and Vickers hardness increases about 50, and elastic modulus is between 4575 GPa. When the oxygen content exceeds 0.6%, the plasticity of the alloy becomes worse.
【作者单位】：东南大学材料科学与工程学院;江阴市产品质量监督检验所;
【分类号】：TG146.23

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