Fabrication of high-strength Ti materials by in-process solid solution strengthening of oxygen via P/M methods
Fabrication of high-strength Ti materials by in-process solid solution strengthening of oxygen via P/M methods
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DOI：
10.1016/j.msea.2012.11.058
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发表时间：
2013-02
期刊：
影响因子：
6.4
通讯作者：
Bin Sun;Shufeng Li;H. Imai;Takanori Mimoto;J. Umeda;K. Kondoh
中科院分区：
文献类型：
--
作者：
Bin Sun;Shufeng Li;H. Imai;Takanori Mimoto;J. Umeda;K. Kondoh
由于材料成本昂贵，塑性成形性差，钛及其合金的应用仅限于高性能产品。本研究以纯钛粉末为原料，采用不同的粉末冶金工艺对纯钛及其合金进行固结，以探索一条经济高效的工艺路线。采用温压实法和冷压实法对钛粉进行固结，并以火花等离子烧结（SPS）作为参考方法。然后对得到的压块进行热挤压。对热挤压纯钛的显微组织和力学性能进行了评价。结果表明，温压成型试样的极限抗拉强度为973.6MPa，延伸率为26%，维氏硬度为389.8Hv。讨论了晶粒取向、晶粒细化和固溶强化对力学性能的影响。研究发现，温压试样的强化机制主要是过程中产生的氧固溶体强化。氧固溶体的强化效果为769.8MPa/质量% [O]。
The applications of Ti and its alloys are limited to high-performance products because of the expensive material cost and poor plastic formability. In order to develop a cost-effective processing route for pure Ti and its alloys, pure Ti powder was used as raw material and consolidated by different powder metallurgy routes in this study. Warm compaction and cold compaction were employed to consolidate Ti powder and spark plasma sintering (SPS) was used as a reference method. The obtained compacts were hot extruded subsequently. The microstructures and mechanical properties of the hot-extruded pure Ti were evaluated. It was found that the samples prepared by warm compaction showed a higher ultimate tensile strength of 973.6MPa, a better elongation of 26% and a higher Vickers hardness of 389.8Hv compared with the other two methods. Effects of grain orientation, grain refinement and solid solution strengthening on mechanical properties were discussed. It was found that the main strengthening mechanism for the sample prepared by warm compaction was oxygen solid solution strengthening resulting from in-process in this study. The strengthening effect of oxygen solid solution was calculated as 769.8MPa/mass% [O].