甘晨,罗雷,杨西荣,刘晓燕,杨博海,闫文文

• 1:西安建筑科技大学冶金工程学院

摘要(Abstract)：

采用四道次等通道转角挤压(Equal channel angular pressing, ECAP)和旋锻(Rotary swaging, RS)复合变形工艺将TA1纯钛(CP-Ti)制备成超细晶工业纯钛(UFG CP-Ti),研究了不同退火温度(200～500℃)对UFG CP-Ti显微组织及力学性能的影响。结果表明：经ECAP+RS工艺处理后，CP-Ti的晶粒尺寸明显细化，平均晶粒尺寸从28μm细化至180 nm,抗拉强度和屈服强度显著增加，分别从255和310 MPa提高到816和835 MPa,但伸长率从20%降低到15%。在200～350℃退火时，UFG CP-Ti的位错密度降低，显微硬度缓慢下降，晶粒发生回复过程。在400℃退火时，发生了再结晶和晶粒长大，退火温度升高到500℃时，晶粒长大至2μm,显微硬度显著下降。经350℃退火后，UFG CP-Ti的力学性能较好，其屈服强度、抗拉强度和伸长率分别为604 MPa、618 MPa和24%,拉伸试样的断口存在大量的韧窝，韧窝的平均直径小于2μm,表现出典型的韧性断裂特征。

关键词(KeyWords)： 超细晶工业纯钛;等通道转角挤压+旋锻;退火温度;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51474170);; 陕西省自然科学基金面上项目(2020JM-493);; 西安建筑科技大学国基金培育专项(X20240094)

作者(Author): 甘晨,罗雷,杨西荣,刘晓燕,杨博海,闫文文

DOI: 10.13289/j.issn.1009-6264.2024-0157

参考文献(References)：

• [1] Won J W,Lee J H,Jeong J S,et al.High strength and ductility of pure titanium via twin-structure control using cryogenic deformation[J].Scripta Materialia,2020,178:94-98.
• [2] Dong R F,Zhang X Y,Kou H C,et al.Texture evolution associated with the preferential recrystallization during annealing process in a hot-rolled near β titanium alloy[J].Journal of Materials Research and Technology,2021,12:63-73.
• [3] Han P S,Xing Y L,Yuan G F,et al.Experimental investigation of the multi-stage micro-deep drawing of pure titanium foils with different grain sizes[J].Journal of Materials Science,2022,57(31):15094-15108.
• [4] Chehrehsaz Y,Hajizadeh K,Hadjizadeh A,et al.Effect of ECAP on physicochemical and biological properties of TiO2 nanotubes anodized on commercially pure titanium[J].Metals and Materials International,2022,28(6):1525-1535.
• [5] Gu Y X,Jiang J H,Ma A B,et al.Enhanced corrosion behavior of ultrafine-grained pure titanium in simulated high-temperature seawater[J].Journal of Materials Research and Technology,2022,19:1-6.
• [6] Edalati K,Bachmaier A,Beloshenko V A,et al.Nanomaterials by severe plastic deformation:review of historical developments and recent advances[J].Materials Research Letters,2022,10(4):163-256.
• [7] Sahoo P S,Meher A,Mahapatra M M,et al.Understanding the fabrication of ultrafine grains through severe plastic deformation techniques:An overview[J].Journal of the Minerals,2022,74(10):3887-3909.
• [8] Gu Y X,Ma A B,Jiang J H,et al.Microstructure and tensile anisotropy of pure Ti processed by up-scaled RD-ECAP[J].Materials Characterization,2020,168:110513.
• [9] Shirooyeh M,Xu J,Langdon T G.Microhardness evolution and mechanical characteristics of commercial purity titanium processed by high-pressure torsion[J].Materials Science and Engineering A,2014,614:223-231.
• [10] Majchrowicz K,Sotniczuk A,Malicka J,et al.Thermal stability and mechanical behavior of ultrafine-grained titanium with different impurity content[J].Materials,2023,16(4):1339.
• [11] Mironov S,Zherebtsov S,Semiatin S L.The grain-refinement mechanism during heavy cold-rolling of commercial-purity titanium[J].Journal of Alloys and Compounds,2022,895:162689.
• [12] Alawadhi M Y,Sabbaghianrad S,Huang Y,et al.Evaluating the paradox of strength and ductility in ultrafine-grained oxygen-free copper processed by ECAP at room temperature[J].Materials Science and Engineering A,2021,802:140546.
• [13] Song D,Li C,Liang N N,et al.Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing[J].Materials & Design,2019,166:107621.
• [14] 乔珍，刘晓燕，赵西成，等.退火温度对ECAP+CR制备的超细晶纯钛组织及性能影响[J].稀有金属材料与工程，2017,46(9):2618-2622.QIAO Zhen,LIU Xiao-yan,ZHAO Xi-cheng,et al.Effect of annealing temperature on microstructure and properties of ultra-fine grained commercial purity titanium by ECAP+CR[J].Rare Metal Materials and Engineering,2017,46(9):2618-2622.
• [15] 宋小杰.室温ECAP+旋锻复合加工纯钛材的组织性能研究[D].西安：西安建筑科技大学，2016.SONG Xiao-jie.Microstructure and property of commercially pure titanium processed by ECAP and rotary swaging at room temperature[D].Xi’an:Xi’an University of Architecture and Technology,2016.
• [16] Dyakonov G,Mironov S,Yakovleva T,et al.Thermal stability and recrystallization of titanium grade 4 with ultrafine-grained structure[C]//The 14th World Conference on Titanium,In MATEC Web of Conferences,EDP Sciences,2020,321:11060.
• [17] 高飞龙，刘晓燕，杨西荣，等.纯钛室温ECAP和旋锻复合变形过程中的织构演变[J].塑性工程学报，2022,29(3):117-23.GAO Fei-long,LIU Xiao-yan,YANG Xi-rong,et al.Texture evolution of pure titanium during ECAP and rotary-swaging composite deformation at room temperature[J].Journal of Plasticity Engineering,2022,29(3):117-123.
• [18] Meng A,Chen X,Nie J F,et al.Microstructure evolution and mechanical properties of commercial pure titanium subjected to rotary swaging[J].Journal of Alloys and Compounds,2021,859:158222.
• [19] Kang D H,Kim T W.Mechanical behavior and microstructural evolution of commercially pure titanium in enhanced multi-pass equal channel angular pressing and cold extrusion[J].Materials & Design,2010,31:S54-S60.
• [20] Mertova K,Palan J,Duchek M,et al.Continuous production of pure titanium with ultrafine to nanocrystalline microstructure[J].2020,13(2):336-349.
• [21] Nasiri-Abarbekoh H,Ekrami A,Ziaei-Moayyed A,et al.Effects of rolling reduction on mechanical properties anisotropy of commercially pure titanium[J].Materials & Design,2012,34:268-274.
• [22] 李瑞，岳旭，董轶，等.大规格纯钛细晶棒材的锻造工艺[J].材料热处理学报，2019,40(4):28-33.LI Rui,YUE Xu,DONG Yi,et al.Forging process of large size pure titanium fine grain bar[J].Transactions of Materials and Heat Treatment,2019,40(4):28-33.
• [23] Zhao S,Wang Y,Peng L,et al.Effect of annealing temperature on microstructure and mechanical properties of cold-rolled commercially pure titanium sheets[J].Transactions of Nonferrous Metals Society of China,2022,32(8):2587-2597.
• [24] 曹晓，贾淑果，朱倩倩，等.旋压工业纯钛TA1的形变及退火行为[J].材料热处理学报，2023,44(8):67-75.CAO Xiao,JIA Shu-guo,ZHU Qian-qian,et al.Deformation and annealing behavior of spinning commercially pure titanium TA1[J].Transactions of Materials and Heat Treatment,2023,44(8):67-75.
• [25] Song X,Wang L,Wang R,et al.Effects of annealing on microstructure evolution and mechanical properties of constrained groove pressed pure titanium[J].Materials Science and Engineering A,2022,831:142245.
• [26] Wu H,Jiang J,Liu H,et al.Fabrication of an ultra-fine grained pure titanium with high strength and good ductility via ECAP plus cold rolling[J].Metals,2017,7(12):563.
• [27] Nath P,Marandi L,Sen I.Processing-microstructure-property correlation in thermo-mechanically processed Ti-6Al-4V alloys:A comparative study between conventional and novel approaches[J].Journal of Alloys and Compounds,2022,927:167039.
• [28] Polyakov A V,Semenova I P,Bobruk E V,et al.Impact toughness of ultrafine-grained commercially pure titanium for medical application[J].Advanced Engineering Materials,2018,20(5):1700863.
• [29] Daming N,Zhen L,Zhan K F.Grain size effect of commercial pure titanium foils on mechanical properties,fracture behaviors and constitutive models[J].Journal of Materials Engineering and Performance,2017,26(3):1283-1292.

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