Advanced mechanical properties of powder metallurgy commercially pure titanium with a high oxygen concentration
Advanced mechanical properties of powder metallurgy commercially pure titanium with a high oxygen concentration
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DOI：
10.1557/jmr.2017.338
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发表时间：
2017-10
影响因子：
2.7
通讯作者：
Biao Chen;J. Shen;X. Ye;J. Umeda;K. Kondoh
中科院分区：
文献类型：
--
作者：
Biao Chen;J. Shen;X. Ye;J. Umeda;K. Kondoh
已知氧对钛合金的强度具有显著影响，而它也可以显著降低延展性。因此，在工业上使用氧来强化Ti受到限制。本研究以开发不使用昂贵有毒元素的高强度、高塑性钛合金为目的，重新点燃了氧在钛中行为的研究。为此，进行了仅使用氧固溶体生产高性能工业纯钛的实验。采用两种不同的粉末冶金方法将氧元素引入钛中。对试样进行了显微组织观察和力学性能测试，结果表明，尽管采用了不同的工艺路线，但氧的强化作用仍然很强。最重要的是，结果表明，在具有超过800 MPa的屈服应力的样品中仍然可以获得超过20%的高断裂伸长率，直到氧含量为0.8wt%，这远远超过了先前公认的极限。
Oxygen is known to have a significant impact on the strength of Ti alloys, whereas it can also reduce the ductility substantially. Thus, the usage of oxygen to strengthen Ti is restricted in the industry. In this study, we rekindled the research of oxygen behavior in Ti with the purpose of developing Ti alloys with high strength and suitable ductility by using no expensive and poisonous element. To this end, experiments of producing high performance commercially pure Ti using only oxygen solid solution were carried out. The oxygen element was introduced into the Ti by two different powder metallurgy methods. The microstructural examination and mechanical test were performed for the samples, which indicated a strong hardening effect of oxygen in spite of the processing routes. Most importantly, the results suggested that a high elongation to failure of over 20% can still be obtained in the samples having yield stress over 800 MPa, up to an oxygen content of 0.8 wt%, which is far beyond the previously recognized limit.