La添加对Ti-6Al-4V合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.12.037

摘要/Abstract

摘要： 采用真空非自耗电弧熔炼法制备了不同La含量的Ti-6Al-4V-xLa合金(x=0.1、0.3、0.5、0.7、0.9),研究了La添加对Ti-6Al-4V合金相结构、微观组织及性能的影响。结果表明,稀土元素La的添加使得合金中α相的片层间距以及β晶粒尺寸明显减小,显著细化晶粒。随着La含量的增加,析出的等轴状La₂O₃颗粒逐渐增多,且大部分存在合金的晶界处。压缩性能测试显示,当La含量为0.7%时,合金的压缩屈服强度、抗压强度和显微硬度达到最佳状态,分别比未添加La的Ti-6Al-4V合金提高了49.45%、25.4%和30.1%,达到了1088 MPa、1777 MPa以及389 HV0.2。过量的La添加(0.9%)使合金晶界富La颗粒,易形成裂纹源,严重损害合金的塑性和抗压强度。

关键词: Ti-6Al-4V合金, 稀土元素La, 微观组织, 性能

Abstract: To investigate the effect of La addition on the alloy phase structure, microstructure and mechanical properties of Ti-6Al-4V alloy, a series of Ti-6Al-4V-xLa alloys (x=0.1, 0.3, 0.5, 0.7, 0.9) with different La content was prepared via vacuum consumable arc melting. The results show that the addition of La leads to a significant reduction in the lamellar spacing of the α-phase and the grain size of the β-phase in the alloy, resulting in a notable refinement of the grains. With the increase of La content, the number of precipitated equiaxed La₂O₃ particles gradually increases, with the majority of them being located at grain boundaries of the alloy. The compression properties test reveals that the addition of 0.7%La results in the alloy achieving the optimum values for compressive yield strength, compressive strength and microhardness, which are increased by 49.45%, 25.4% and 30.1%, respectively, compared with that of the Ti-6Al-4V alloy without La addition, reaching 1088 MPa, 1777 MPa and 389 HV0.2. Excessive addition of La (approximately 0.9%) to the Ti-6Al-4V alloy results in the formation of La-rich particles at the alloy grain boundaries, which is easy to lead to the formation of crack sources, and significantly reduces the plasticity and compressive strength of the alloy.

Key words: Ti-6Al-4V alloy, rare earth La, microstructure, properties

中图分类号:

TG166.5

李益生, 范翰, 景然, 李江华. La添加对Ti-6Al-4V合金组织与性能的影响[J]. 金属热处理, 2025, 50(12): 239-244.

Li Yisheng, Fan Han, Jing Ran, Li Jianghua. Effect of La addition on microstructure and properties of Ti-6Al-4V alloy[J]. Heat Treatment of Metals, 2025, 50(12): 239-244.

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