九州大学学術情報リポジトリ Kyushu University Institutional Repository Processing Pure Ti by High-Pressure Torsion in Wide Ranges of Pressures and Strain
九州大学学術情報リポジトリ Kyushu University Institutional Repository Processing Pure Ti by High-Pressure Torsion in Wide Ranges of Pressures and Strain
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通讯作者：
Kaveh Edalatia;Eiichiro Matsubarab;Zenji Horitaa
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作者：
Kaveh Edalatia;Eiichiro Matsubarab;Zenji Horitaa
纯钛（99.4%）在1.2至40吉帕斯卡（GPa）的广泛压力范围内通过高压扭转（HPT）进行加工，等效应变高达~200。X射线衍射（XRD）分析表明，当压力大于~ 4GPa时，HPT过程中发生了由α相到ω相的压致相变，应变促进了这种相变。相变使合金的硬度和抗拉强度提高，塑性降低。硬度测量结果表明，当它们被绘制为等效应变的函数时，在每个压力下获得的所有值都落在单个曲线上。在应变的早期阶段，硬度随着等效应变的增加而增加，并且饱和到恒定水平，其中硬度随着进一步的应变而保持不变。它示出的饱和度以及饱和的发病取决于所施加的压力。* 联系电子邮件：kaveh. zaiko6.zaiko.kyushu-u.ac.jp
Pure Ti (99.4 pct) is processed by high-pressure torsion (HPT) at applied pressures in a wide range of 1.2 to 40 giga-pascals (GPa) for equivalent strain up to ~200. X-ray diffraction (XRD) analysis clearly reveals that a pressure-induced phase transformation occurs from α phase to ω phase during HPT processing when the applied pressure is more than ~4 GPa and the straining facilitates this phase transformation. The hardness and the tensile strength increase, but the ductility decreases by the phase transformation. Hardness measurements demonstrate that all values obtained at each pressure fall on a single curve when they are plotted as a function of equivalent strain. The hardness increases with an increase in the equivalent strain at an early stage of straining and saturates to a constant level, where the hardness remains unchanged with further straining. It is shown that the saturation level as well as the onset of the saturation depends on the applied pressure. * Contact e-mail: kaveh.edalati@zaiko6.zaiko.kyushu-u.ac.jp