TC4ELI合金经热加工后的组织和力学性能研究

吕美源; 孙伟豪; 尹权丰; 徐长城; 冷信林; 唐明尧; 田思雨; 马明庆; 任玉平; 蔡明晖; 蒋敏; 秦高梧

doi:10.3969/j.issn.1674-6457.2026.10.008

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (10) : 82-91. DOI: 10.3969/j.issn.1674-6457.2026.10.008

轻合金成形

TC4ELI合金经热加工后的组织和力学性能研究

吕美源^1a,1b, 孙伟豪^1a,1b, 尹权丰², 徐长城², 冷信林^1c, 唐明尧², 田思雨², 马明庆², 任玉平^1a,1b*, 蔡明晖^1a, 蒋敏^1a, 秦高梧^1a,3

作者信息 +

Microstructure and Mechanical Properties of TC4ELI Alloy after Hot Working

LYU Meiyuan^1a,1b, SUN Weihao^1a,1b, YIN Quanfeng², XU Changcheng², LENG Xinlin^1c, TANG Mingyao², TIAN Siyu², MA Mingqing², REN Yuping^1a,1b*, CAI Minghui^1a, JIANG Min^1a, QIN Gaowu^1a,3

Author information +

文章历史 +

摘要

目的系统比较医用TC4ELI合金棒材在连续热加工不同阶段的组织演化及力学性能变化,揭示多阶段热加工条件下组织重构、织构变化与力学性能之间的对应关系,为医用TC4ELI合金棒材热加工工艺优化及组织性能调控提供参考。方法采用金相显微镜（OM）、电子背散射衍射（EBSD）和室温拉伸测试手段,对铸态、锻造态、轧制态和拉拔态TC4ELI合金的显微组织和力学性能进行研究。结果铸态形成的魏氏组织经高温β相区锻造后转变成细片层的网篮组织,α相片层间距细化至0.96 μm;随后经α+β两相区热轧后,组织进一步细化,α相平均晶粒尺寸细化至0.9 μm,沿轧向略有伸长,取向集中于<10-10>。进一步在α+β两相区拉拔时,尽管α相平均晶粒尺寸约为0.7 μm,但沿拉拔方向存在明显的纤维化组织特征,取向呈<10-10>平行于拉拔方向。最终,轧制态TC4ELI合金展示出最佳综合力学性能,其屈服强度、抗拉强度和延伸率分别为937 MPa、1 022 MPa和16.9%;拉拔态表现出更高的屈服强度和抗拉强度,但伸长率显著降低,分别为1 022 MPa、1 208 MPa和8.2%。结论连续热加工能够促进铸态TC4ELI合金组织的细化与重构,并引起织构和力学性能的明显变化,其中轧制态表现出最佳强塑匹配,拉拔态获得最高强度。

Abstract

The work aims to systematically compare the microstructural evolution and changes in mechanical properties of medical TC4ELI alloy bars at different stages of continuous hot working and reveal the corresponding relationship among microstructural reconstruction, texture evolution, and mechanical properties under multi-stage hot working conditions, so as to provide a reference for hot working process optimization and microstructure-property regulation of medical TC4ELI alloy bars. Optical microscopy (OM), electron backscatter diffraction (EBSD), and room-temperature tensile testing were employed to investigate the microstructure and mechanical properties of TC4ELI alloy in the as-cast, forged, rolled, and drawn states. The Widmanstätten microstructure formed in the as-cast alloy was transformed into a fine lamellar basketweave microstructure after forging in the high-temperature β phase region, and the α lamellar spacing was refined to 0.96 μm. After subsequent hot rolling in the α+β two-phase region, the microstructure was further refined, and the average α grain size was reduced to 0.9 μm. The grains were slightly elongated along the rolling direction, with the preferred orientation concentrated near <10-10>. During further hot drawing in the α+β two-phase region, although the average α grain size was about 0.7 μm, the microstructure exhibited obvious fibrous characteristics along the drawing direction, and the preferred orientation remained <10-10> parallel to the drawing direction. Finally, the rolled TC4ELI alloy exhibited the best overall mechanical properties, with a yield strength, ultimate tensile strength, and elongation of 937 MPa, 1 022 MPa, and 16.9%, respectively. In contrast, the drawn alloy showed higher yield strength and ultimate tensile strength, reaching 1 022 MPa and 1 208 MPa, respectively, but the elongation decreased significantly to 8.2%. Continuous hot working can promote the refinement and reconstruction of the microstructure of as-cast TC4ELI alloy and lead to obvious changes in texture and mechanical properties. Among the different states, the rolled alloy shows the best strength-ductility balance, whereas the drawn alloy achieves the highest strength.

导出引用

吕美源, 孙伟豪, 尹权丰, 徐长城, 冷信林, 唐明尧, 田思雨, 马明庆, 任玉平, 蔡明晖, 蒋敏, 秦高梧. TC4ELI合金经热加工后的组织和力学性能研究[J]. 精密成形工程. 2026, 18(10): 82-91 https://doi.org/10.3969/j.issn.1674-6457.2026.10.008

LYU Meiyuan, SUN Weihao, YIN Quanfeng, XU Changcheng, LENG Xinlin, TANG Mingyao, TIAN Siyu, MA Mingqing, REN Yuping, CAI Minghui, JIANG Min, QIN Gaowu. Microstructure and Mechanical Properties of TC4ELI Alloy after Hot Working[J]. Journal of Netshape Forming Engineering. 2026, 18(10): 82-91 https://doi.org/10.3969/j.issn.1674-6457.2026.10.008

中图分类号： TG146.23

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