Effect of boron content on microstructure and properties of Ti-Zr-Nb-B alloys

doi:10.13251/j.issn.0254-6051.2023.09.027

Abstract

Abstract: Ti-Zr-Nb-B alloys with different boron contents were prepared by non-consumable vacuum arc furnace. The microstructure, mechanical properties and corrosion resistance of the alloys were studied by means of X-ray diffractometer (XRD), optical microscope (OM), universal testing machine and electrochemical workstation. The results show that the boron element causes the appearance of a small amount of acicular α phase in the alloy, the microstructure of the alloy changes from equiaxed to dendritic structure and the grain is obviously refined, and TiB and ZrB₂ compounds are precipitated at the dendrite arms, and the dendrite is coarsened when the atom fraction of boron is 2.0% and 4.0%. With the increase of boron content, the hardness of the alloy increases, the plasticity decreases, and the yield strength increases at first, then decreases, and then increases. When the atom fraction of boron is 4.0%, the yield strength and hardness of the alloy reach the maximum values of 843 MPa and 281 HV0.2. The corrosion test in 3.5%NaCl solution shows that the addition of boron reduces the corrosion resistance of the alloy, the (TiZr)₉₀Nb₁₀ alloy has the best corrosion resistance, and the (TiZr)_89.5Nb₁₀B_0.5 alloy has the worst corrosion resistance.

Key words: Ti-Zr-Nb-B alloy, microstructure, mechanical properties, corrosion resistance

CLC Number:

TG146.23

Li Wengang, Chui Pengfei, Cheng Zunpeng, Li Chunmei, Jing Ran, Li Jianghua, Liao Zhongni. Effect of boron content on microstructure and properties of Ti-Zr-Nb-B alloys[J]. Heat Treatment of Metals, 2023, 48(9): 157-164.

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