{332}<113>孿晶與等溫ω相的組合對不同O含量Ti-15Mo合金力學(xué)性能的影響

{332}<113>孿晶與等溫ω相的組合對不同O含量Ti-15Mo合金力學(xué)性能的影響Effect of {332}<113> twins combined with isothermal ω-phase on mechanical properties in Ti-15Mo alloy with different oxygen contents

利用OM、XRD、TEM、DSC、Vickers硬度計(jì)和拉伸試驗(yàn)機(jī)等手段研究了拉伸預(yù)變形誘發(fā){332}<113>孿晶與隨后時(shí)效析出等溫ω相對不同O含量 (0.1 % ~ 0.5 %，質(zhì)量分?jǐn)?shù)) β型Ti-15Mo合金力學(xué)性能的影響。結(jié)果表明，隨著合金中O含量的增加，機(jī)械孿晶的形成以及等溫ω相的析出受到了抑制，且拉伸預(yù)變形誘發(fā)孿晶對等溫ω相析出的影響較小。經(jīng)拉伸預(yù)變形和隨后時(shí)效處理，低O含量合金呈現(xiàn)出較高的屈服強(qiáng)度和較好的均勻伸長率，而高O含量合金發(fā)生脆性斷裂。孿生與位錯(cuò)滑移的耦合塑性變形使得低O含量合金呈現(xiàn)出良好的強(qiáng)度和塑性匹配，其高的屈服強(qiáng)度主要受位錯(cuò)滑移主導(dǎo)，良好的均勻伸長率主要?dú)w因于預(yù)變形誘發(fā)孿晶的靜態(tài)晶粒細(xì)化以及后續(xù)孿生變形導(dǎo)致的動態(tài)晶粒細(xì)化效應(yīng)。這些結(jié)果表明，通過對合金元素O的有效利用，以及合理的預(yù)變形與熱處理制度，能夠改變塑性變形方式和相析出行為，從而在較大范圍內(nèi)調(diào)控β型鈦合金的強(qiáng)度和塑性匹配。

β-type alloys have a wide application prospect in aerospace, biomedical and marine engineering and other fields, owing to their high specific strength, good corrosion resistance and low elastic modulus. Their yield strength and uniform elongation are affected by the second phase precipitation, plastic deformation mode and interstitial element, especially the oxygen element. In this work, the effect of tensile pre-deformation induced {332}<113> twins combined with isothermal ω-phase after subsequent ageing on the mechanical properties of β-type Ti-15Mo alloy with different oxygen contents from 0.1 % to 0.5 % (mass fraction) was examined by OM, XRD, TEM, DSC, Vickers hardness tester and tensile testing machine. The results indicated that with increasing the oxygen content, the formation of mechanical twins and isothermal ω-phase in the alloy was suppressed, and the effect of pre-deformation induced twins on the precipitation of isothermal ω-phase was negligible. After pre-deformation combined with subsequent ageing, the alloy with low oxygen content had the relatively high yield strength and large uniform elongation, but it with high oxygen content exhibited the brittle fracture. A good combination of strength with ductility in the alloy with low oxygen content was contributed to the twinning and dislocation slip coupled deformation. The high yield strength was mainly dominated by the dislocation slip, and the large uniform elongation was due to the static and dynamic grain refinement effects, which were caused by the pre-deformation induced twins and subsequent twinning deformation, respectively. Through utilizing the alloying element of oxygen effectively, and changing the plastic deformation mode and phase precipitation behavior based on the reasonable process of pre-deformation and heat treatment, the combination of strength and ductility can be controlled in a large range for the β-type titanium alloys.

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