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Size effects on the tensile properties and deformation mechanism of commercial pure titanium foils

机译：尺寸对商品纯钛箔拉伸性能和变形机理的影响

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摘要

To identify the size effects on the mechanical behavior of microparts is essential for micro-forming. Here, the size effect on the tensile properties of commercial pure titanium foils with thickness ranging from 5 mu m to 200 mu m has been investigated. The tensile strength, yield strength and work-hardening rate reach a minimum value at the thickness of 30 mu m because the main deformation microstructures including dislocations, twins and deformation induced face-centered cubic titanium (fcc-Ti) are different in different foils. The density of deformation twins decreases as the thickness decreases. However, the density of fcc-Ti increases and reaches a maximum value at the thickness of 30 mu m. The dominant deformation mechanism is dislocation slip when the thickness is below 20 mu m. The yield strength decreases with the decrease in thickness because of the strengthening effect of fcc-Ti being smaller than that of twins when the thickness is above 30 mu m. When the ratio of the thickness to grain size is below 5, the yield strength increases with the decrease in thickness due to the large volume fraction of oxides layer on the surface. Based on these, two kinds of constitutive equations have been well established in consideration of the grain size or the ratio of the thickness to grain size.
机译：识别尺寸对微零件机械性能的影响对于微成形至关重要。在此，已研究了尺寸对厚度在5微米至200微米范围内的商用纯钛箔的拉伸性能的影响。抗拉强度，屈服强度和加工硬化率在厚度为30μm时达到最小值，这是因为在不同的箔片中，包括位错，孪晶和由变形引起的面心立方钛（fcc-Ti）的主要变形微观结构不同。变形孪晶的密度随着厚度的减小而减小。然而，fcc-Ti的密度增加并且在30μm的厚度处达到最大值。当厚度小于20μm时，主要的变形机理是位错滑移。屈服强度随厚度的减小而降低，这是因为当厚度大于30μm时，fcc-Ti的增强作用小于孪晶。当厚度与晶粒尺寸的比率小于5时，由于表面上的氧化物层的体积分数大，因此屈服强度随着厚度的减小而增加。基于这些，考虑晶粒尺寸或厚度与晶粒尺寸的比率，已经很好地建立了两种本构方程。

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  • 来源
    《Materials Science and Engineering》 |2018年第jul11期|244-261|共18页
  • 作者

    Wang S.; Niu L.; Chen C.; Pang Y.; Liao B.; Zhong Z. H.; Lu P.; Li P.; Wu X. D.; Coenen Jan W.; Cao L. F.; Wu Y. C.;

  • 作者单位

    Hefei Univ Technol Inst Ind & Equipment Technol Hefei 230009 Anhui Peoples R China|China Int S&T Cooperat Base Adv Energy & Environm Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Inst Ind & Equipment Technol Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Mat Sci & Engn Hefei 230009 Anhui Peoples R China|China Int S&T Cooperat Base Adv Energy & Environm Hefei 230009 Anhui Peoples R China|Forschungszentrum Julich Inst Energie & Klimaforsch Plasmaphys D-52425 Julich Germany;

    Cent S Univ Sch Mat Sci & Engn Changsha 410083 Hunan Peoples R China;

    Chongqing Univ Minist Educ Coll Mat Sci & Engn Int Joint Lab Light Alloys Chongqing 400044 Peoples R China;

    Hefei Univ Technol Sch Mat Sci & Engn Hefei 230009 Anhui Peoples R China|China Int S&T Cooperat Base Adv Energy & Environm Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Inst Ind & Equipment Technol Hefei 230009 Anhui Peoples R China|Xi An Jiao Tong Univ State Key Lab Strength & Vibrat Mech Struct Xian 710049 Shanxi Peoples R China;

    Forschungszentrum Julich Inst Energie & Klimaforsch Plasmaphys D-52425 Julich Germany;

    Hefei Univ Technol Inst Ind & Equipment Technol Hefei 230009 Anhui Peoples R China|Hefei Univ Technol Sch Mat Sci & Engn Hefei 230009 Anhui Peoples R China|China Int S&T Cooperat Base Adv Energy & Environm Hefei 230009 Anhui Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Titanium foils; Size effects; Mechanical behavior; Constitutive equation; Deformation mechanism;

    机译：钛箔;尺寸效果;机械性能;本构方程;变形机制;

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