在400℃采用BC路径等通道弯角挤压对工业纯钛进行了8道次处理,用透射电镜分析了微观组织,并以林格式人工模拟体液为腐蚀介质,采用电化学阻抗谱对耐蚀性进行了研究.结果表明,8道次后纯钛主要由细小等轴晶粒所构成,平均晶粒尺寸＜500 nm.不同道次处理后,纯钛腐蚀性能排序为退火粗晶态＜2道次＜1道次＜4道次＜8道次.8道次后耐蚀性能最优,2道次却弱于1道次.2道次后晶粒细化,但大变形引起织构组分改变使得平行于样品表面的晶面由上一道次(011－0)晶面演变成高指数晶面(112－0),导致耐蚀性能下降,表明纯钛耐腐蚀行为同时受到晶粒尺寸和织构的影响.
Commercially pure Ti was prepared by multi-pass ECAE at 400 ℃ via route Bc.The microstructures evolution were characterized by transmission election microscopy (TEM).The electrochemical corrosion behav-iors in Ringer’s solution were investigated by electrochemical impedance spectroscopy (EIS)measurement.Af-ter eight-passes ECAE treatment,the microstructure becomes more homogeneous and the fraction of fine equi-axed grains increases,smaller than 0.5μm.The corrosion resistance of CP-Ti sample with different pass ECAE treatment increases in the order of zero-pass,two-passes,one-pass,four-passed and eight-passes.The eight-passes ECAEed CP-Ti have the best corrosion resistance.The corrosion resistance of two-passes sample is not inferior to one-pass although the microstructure is refined.The crystallographic plane parallel to the surface of ECAEed samples is changed from (011-0)plane in one-pass to (112-0)high index plane in two-passes and results the reduce of corrosion resistant performance.It indicates that the electrochemical corrosion behaviour of CP-Ti is effected simultaneously by grain size and texture during multi-pass ECAE process.
参考文献
| [1] | Vladimir V. Stolyarov;Y. Theodore Zhu;Igor V. Alexandrov;Terry C. Lowe;Ruslan Z. Valiev.Influence of ECAP routes on the microstructure and properties of pure Ti[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20011/2(1/2):59-67. |
| [2] | Garbacz H;Pisarek M;Kurzydlowski KJ.Corrosion resistance of nanostructured titanium.[J].Biomolecular engineering,20075(5):559-563. |
| [3] | Faghihi S;Azari F;Zhilyaev AP;Szpunar JA;Vali H;Tabrizian M.Cellular and molecular interactions between MC3T3-E1 pre-osteoblasts and nanostructured titanium produced by high-pressure torsion.[J].Biomaterials,200727(27):3887-3895. |
| [4] | V.A inogradov;T. Mimaki;S.Hashimoto;R.Valiev.On the corrosion behaviour of ultra-fine grain copper.[J].Scripta materialia,19993(3):319-326. |
| [5] | Min-Kyong Chung;Yoon-Seok Choi;Jung-Gu Kim.Effect of the number of ECAP pass time on the electrochemical properties of 1050 Al alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20042(2):282-291. |
| [6] | A. Balyanov;J. Kutnyakova;N. A. Amirkhanova;V. V. Stolyarov;R. Z. Valiev;X. Z. Liao;Y. H. Zhao;Y. B. Jiang;H. F. Xu;T. C. Lowe.Corrosion resistance of ultra fine-grained Ti[J].Scripta materialia,20043(3):225-229. |
| [7] | I. Kim;J. Kim;D. H. Shin;X. Z. Liao;Y. T. Zhu.Deformation twins in pure titanium processed by equal channel angular pressing[J].Scripta materialia,20036(6):813-817. |
| [8] | Abdollah Salimi;Mahmoud Roushani;Rahman Hallaj.Micromolar determination of sulfur oxoanions and sulfide at a renewable sol-gel carbon ceramic electrode modified with nickel powder[J].Electrochimica Acta,200610(10):1952-1959. |
| [9] | Comparative effect of grain size and texture on the corrosion behaviour of commercially pure titanium processed by equal channel angular pressing[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,200912(12):3064. |
| [10] | Irene J. Beyerlein;Laszlo S. Toth.Texture evolution in equal-channel angular extrusion[J].Progress in materials science,20094(4):427-510. |
| [11] | Arash Shahryari;Jerzy A. Szpunar;Sasha Omanovic.The Influence Of Crystallographic Orientation Distribution On 316lvm Stainless Steel Pitting Behavior[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,20093(3):677-682. |
| [12] | Jiang H;Fan ZG;Xie CY.3D finite element simulation of deformation behavior of CP-Ti and working load during multi-pass equal channel angular extrusion[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20081/2(1/2):409-414. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%