电解抛光工艺对工业纯钛表面特性的影响
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摘要
选用高氯酸与甲醇混合溶液作为电解液,在-32℃下对预压缩工业纯钛电解抛光3 min。探讨了电解抛光电压和电流密度对纯钛表面特性的影响。采用基于扫描电镜的电子背散射衍射(EBSD)和数字图像相关(DIC)原位法,研究了预压缩工业纯钛中的退孪晶变形。当电解抛光电压和电流密度分别为16 V和8.3～9.3 mA/mm~2时,EBSD花样标定率和DIC相关性均最好。工业纯钛退孪晶变形表现为较大尺寸孪晶的侧向变窄,部分小尺寸孪晶消失,孪晶附近应变集中。
The pre-compressed commercial pure titanium was electropolished in a mixture containing perchloric acid and methanol at -32 ℃ for 3 min. The effects of electropolishing voltage and current density on the surface characteristics of commercial pure titanium were discussed. The detwinning deformation of pre-compressed commercial pure titanium was studied by in situ electron backscatter diffraction(EBSD) and digital image correlation(DIC) based on scanning electron microscopy(SEM). The pattern calibration rate of EBSD and the DIC data correlation were the best after electropolishing at a voltage of 16 V within a current density range of 8.3-9.3 mA/mm~2. During the detwinning deformation of pure titanium, the large-sized twins become narrower sideways, some small-sized twins disappear, and the strain concentrates near the twins.
The pre-compressed commercial pure titanium was electropolished in a mixture containing perchloric acid and methanol at -32 ℃ for 3 min. The effects of electropolishing voltage and current density on the surface characteristics of commercial pure titanium were discussed. The detwinning deformation of pre-compressed commercial pure titanium was studied by in situ electron backscatter diffraction(EBSD) and digital image correlation(DIC) based on scanning electron microscopy(SEM). The pattern calibration rate of EBSD and the DIC data correlation were the best after electropolishing at a voltage of 16 V within a current density range of 8.3-9.3 mA/mm~2. During the detwinning deformation of pure titanium, the large-sized twins become narrower sideways, some small-sized twins disappear, and the strain concentrates near the twins.
引文
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[17] DI GIOACCHINO F, QUINTA DA F. Plastic strain mapping with sub-micron resolution using digital image correlation[J]. Experimental Mechanics, 2013,53(5):743-754.
[18] ZHAO C, STEWART D, JIANG J, et al. A comparative assessment of iron and cobalt-based hard-facing alloy deformation using HR-EBSD and HR-DIC[J].Acta Materialia, 2018, 159:173-186.
[19]尹树明,宗朔通,刘龙飞.镁合金电解抛光工艺[J].电镀与涂饰,2013, 32(12):46-48.
[20] REGGIANI R C, MAZZA F, SIVIERI E. Electrochemical polishing of titanium in perchloric-methanolic solutions[J].Materials Chemistry, 1979, 4(2):149-158.
[21] XU F, ZHANG X, NI H, et al. Effect of twinning on microstructure and texture evolutions of pure Ti during dynamic plastic deformation[J]. Materials Science and Engineering:A,2013, 564:22-33.
[22] CERQUETTI A, MAZZA F. Electrochemical behaviour and stress-corrosion cracking of titanium in alcoholic solutions[J]. Corrosion Science, 1973, 13(5):337-349.
[23] SCULLY J C, POWELL D T. The stress corrosion cracking mechanism ofα-titanium alloys at room temperature[J]. Corrosion Science, 1970, 10(10):719-733.
[24]刘坤坤,孙伶俐,何声馨,等.316不锈钢电解抛光最佳参数试验研究[J].表面技术,2018, 47(8):288-294.
[2] JIANG X P, WANG X Y, LI J X, et al. Enhancement of fatigue and corrosion properties of pure Ti by sandblasting[J]. Materials Science and Engineering:A,2006, 429(1/2):30-35.
[3]朱永明,屠振密,李宁,等.钛及钛合金表面绿色化学处理新进展[J].电镀与涂饰,2010, 29(2):37-39.
[4] FIZANNE-MICHEL C, CORNEN M, CASTANY P, et al. Determination of hardness and elastic modulus inverse pole figures of a polycrystalline commercially pure titanium by coupling nanoindentation and EBSD techniques[J]. Materials Science and Engineering:A, 2014, 613:159-162.
[5] SINHA S, GHOSH A, GURAO N P. Effect of initial orientation on the tensile properties of commercially pure titanium[J]. Philosophical Magazine, 2016,96(15):1485-1508.
[6]潘金生,仝建民,田民波,材料科学基础[M].北京:清华大学出版社,1998.
[7] SINHA S, PUKENAS A,GHOSH A,et al. Effect of initial orientation on twinning in commercially pure titanium[J]. Philosophical Magazine, 2017, 97(10):775-797.
[8] WANG L, LIND J, PHUKAN H, et al. Mechanical twinning and detwinning in pure Ti during loading and unloading-an in situ high-energy X-ray diffraction microscopy study[J]. Scripta Materialia, 2014,92:35-38.
[9]唐旭,毛圣成,臧科涛,等.纯钛孪生变形行为的原位EBSD研究[J].电子显微学报,2015, 34(5):409-415.
[10] SINHA S, GURAO N P. In situ electron backscatter diffraction study of twinning in commercially pure titanium during tension-compression deformation and annealing[J].Materials&Design, 2016, 116:686-693.
[11] KIM I, KIM J, SHIN D H, et al. Deformation twins in pure titanium processed by equal channel angular pressing[J]. Scripta Materialia, 2003, 48(6):813-817.
[12]樊梦婷,杨华斌,曹继敏.工业纯钛中的形变孪晶演变及其稳定性研究[J].稀有金属,2013,37(2):192-198.
[13]孙巧艳,朱蕊花,刘翠萍,等.工业纯钛机械孪晶演化及其对纯钛低温力学性能的影响[J].中国有色金属学报,2006, 16(4):592-598.
[14] EDWARDS T E J, DI GIOACCHINO F,MUNOZ-MORENO R, et al. Deformation of lamellar TiA1 alloys by longitudinal twinning[J]. Scripta Materialia,2016, 118:46-50.
[15] STINVILLE J C, VANDERESSE N, BRIDIER F, et al. High resolution mapping of strain localization near twin boundaries in a nickel-based superalloy[J].Acta Materialia,2015, 98:29-42.
[16] LUNT D, BUSOLO T, XU X, et al. Effect of nanoscaleα_2, precipitation on strain localisation in a two-phase Ti-alloy[J].Acta Materialia, 2017, 129:72-82.
[17] DI GIOACCHINO F, QUINTA DA F. Plastic strain mapping with sub-micron resolution using digital image correlation[J]. Experimental Mechanics, 2013,53(5):743-754.
[18] ZHAO C, STEWART D, JIANG J, et al. A comparative assessment of iron and cobalt-based hard-facing alloy deformation using HR-EBSD and HR-DIC[J].Acta Materialia, 2018, 159:173-186.
[19]尹树明,宗朔通,刘龙飞.镁合金电解抛光工艺[J].电镀与涂饰,2013, 32(12):46-48.
[20] REGGIANI R C, MAZZA F, SIVIERI E. Electrochemical polishing of titanium in perchloric-methanolic solutions[J].Materials Chemistry, 1979, 4(2):149-158.
[21] XU F, ZHANG X, NI H, et al. Effect of twinning on microstructure and texture evolutions of pure Ti during dynamic plastic deformation[J]. Materials Science and Engineering:A,2013, 564:22-33.
[22] CERQUETTI A, MAZZA F. Electrochemical behaviour and stress-corrosion cracking of titanium in alcoholic solutions[J]. Corrosion Science, 1973, 13(5):337-349.
[23] SCULLY J C, POWELL D T. The stress corrosion cracking mechanism ofα-titanium alloys at room temperature[J]. Corrosion Science, 1970, 10(10):719-733.
[24]刘坤坤,孙伶俐,何声馨,等.316不锈钢电解抛光最佳参数试验研究[J].表面技术,2018, 47(8):288-294.
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