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Superplastic deformation behavior of Ti-55 alloy without and with 0.1 wt% H addition

机译:添加和不添加0.1 wt%H的Ti-55合金的超塑性变形行为

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摘要

The superplastic deformation behaviors of as-received Ti-55 alloy and hydrogenated alloy with 0.1 wt%H were studied. The results indicate y hydride readily decomposes and hydrogen easily escapes under vacuum or argon-protected condition near the starting temperature of α + β /β transformation. Compared with as-received alloy, the optimum superplastic temperature of hydrogenated alloy is reduced by about 125 ℃. Larger decrease of elongation in hydrogenated alloy appears if the deformation temperature and initial strain rate deviate from optimal ones. More proportion of β phase distributes uniformly around a phase grain boundaries and prominently inhabits the formation of voids in hydrogenated alloy during superplastic deformation. Hydrogen addition can lead to the improvement of discontinuous dynamic recrystallization mechanism and deformation compatibility of grain boundaries, as well as the reduction of dislocation pile-ups and tangles.
机译:研究了Ti-55合金和0.1wt%H的氢化合金的超塑性变形行为。结果表明,在α+β/β转变的起始温度附近,y氢化物易于分解,并且在真空或氩保护条件下氢容易逸出。与原合金相比,氢化合金的最佳超塑性温度降低了约125℃。如果变形温度和初始应变速率偏离最佳值,则氢化合金的伸长率会出现更大的降低。 β相的比例更大,均匀分布在相晶界周围,并且明显地占据了超塑性变形过程中氢化合金中空洞的形成。加氢可改善不连续动态再结晶机制,改善晶界变形相容性,并减少位错堆积和缠结。

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