The α → ω Transformation in Titanium-Cobalt Alloys under High-Pressure Torsion
The α → ω Transformation in Titanium-Cobalt Alloys under High-Pressure Torsion
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DOI：
10.3390/met8010001
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发表时间：
2018-01-01
期刊：
影响因子：
2.9
通讯作者：
Hahn, Horst
中科院分区：
文献类型：
--
作者：
Kilmametov, Askar R.;Ivanisenko, Yulia;Hahn, Horst
研究了高压扭转（HPT）过程中压力对Ti-Co合金α -> - ω相变的影响。α -> - omega同素异形体转变发生在高压下的钛、锆和铪及其合金中。压力释放后的过渡压力、高压ω相的保留能力以及α相和ω相共存的压力区间取决于高压处理的条件。布里奇曼砧在高温高压过程中，高压与剪切应变相结合。剪切应变的存在以及Co加入Ti使α -> - omega转变的起始点从10.5 GPa（准流体静力条件下）降低到3.5 GPa左右。在7 GPa高温热处理后ω - 3相的比例按以下顺序增加：纯Ti- > Ti-2 wt % Co -> Ti-4 wt % Co -> Ti-4 wt % Fe。
The pressure influence on the alpha -> omega transformation in Ti-Co alloys has been studied during high pressure torsion (HPT). The alpha -> omega allotropic transformation takes place at high pressures in titanium, zirconium and hafnium as well as in their alloys. The transition pressure, the ability of high pressure omega-phase to retain after pressure release, and the pressure interval where alpha and omega phases coexist depend on the conditions of high-pressure treatment. During HPT in Bridgeman anvils, the high pressure is combined with shear strain. The presence of shear strain as well as Co addition to Ti decreases the onset of the alpha -> omega transition from 10.5 GPa (under quasi-hydrostatic conditions) to about 3.5 GPa. The portion of omega-phase after HPT at 7 GPa increases in the following sequence: pure Ti -> Ti-2 wt % Co -> Ti-4 wt % Co -> Ti-4 wt % Fe.