Effect of Different Heat Treatments on the Microstructure and Mechanical Properties of a Novel Ti421 Alloy

SANG Zhuoyue; WANG Shuai; YIN Wanbing; ZHU Chunming; BAI Zhang; WANG Peng; LUO Jinshan; ZHANG Yongwei; FANG Lue; LI Xiaoyi; ZHOU Zhiming

doi:10.3969/j.issn.1674-6457.2025.09.006

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (9) : 70-78. DOI: 10.3969/j.issn.1674-6457.2025.09.006

Light Alloy Forming

Effect of Different Heat Treatments on the Microstructure and Mechanical Properties of a Novel Ti421 Alloy

SANG Zhuoyue^1,2, WANG Shuai³, YIN Wanbing³, ZHU Chunming³, BAI Zhang², WANG Peng², LUO Jinshan³, ZHANG Yongwei³, FANG Lue³, LI Xiaoyi³, ZHOU Zhiming^1,*

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Abstract

The work aims to obtain the good strength-plastic matching effect of the novel Ti421 alloy. The microstructure and mechanical properties of a novel Ti421 alloy treated by different solution and aging processes were studied. Firstly, under the same aging process, a decrease in the cooling rate after solution treatment led to a significant increase in the content of equiaxed primary α phase (α_p) of the alloy, accompanied by a slight increase in size of α_p. At the same time, the presence of α_p also inhibited the growth of the secondary α phase (α_s) of the alloy during the aging process. Combined with the static tensile test results, it was found that more α_p was beneficial to the plasticity of the alloy. After solution treatment at 900 ℃ and furnace cooling and aging treatment at 500 ℃, the content of α_p of the sample reached the maximum value of 72.8%, indicating that the alloy had the best plasticity (14.2%). In addition, under the fixed conditions of solution treatment, changes in the aging treatment system did not cause the changes in the content and size of α_p. However, with the increase of aging temperature, the content and size of α_s on β_t increased, which led to the trend that the alloy strength firstly increased and then decreased. The alloy achieves good strength-plastic matching with a tensile strength of 1 484 MPa and an elongation of 11.2% after solution treatment at 900 ℃ and water quenching followed with aging treatment at 550 ℃.

Key words

novel Ti421 alloy / microstructure / solution and aging treatment / static tensile properties

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SANG Zhuoyue, WANG Shuai, YIN Wanbing, ZHU Chunming, BAI Zhang, WANG Peng, LUO Jinshan, ZHANG Yongwei, FANG Lue, LI Xiaoyi, ZHOU Zhiming. Effect of Different Heat Treatments on the Microstructure and Mechanical Properties of a Novel Ti421 Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 70-78 https://doi.org/10.3969/j.issn.1674-6457.2025.09.006

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