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Age Hardening and Its Modeling of Ti-10Mo-8V-1Fe-3.5Al Alloy
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Age Hardening and Its Modeling of Ti-10Mo-8V-1Fe-3.5Al Alloy
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National Natural Science Foundation of China (51101068, 50831004)

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    摘要:

    對Ti-10Mo-8V-1Fe-3.5Al (TB3)合金時效強(qiáng)化過程及時效強(qiáng)化機(jī)制進(jìn)行了詳細(xì)研究。對時效后經(jīng)過塑性變形的TB3樣品進(jìn)行透射電子顯微鏡（TEM）觀察發(fā)現(xiàn)：在早期時效樣品中，位錯可以繞過細(xì)小的α片；而在時效后期的樣品中，α片尺寸長大且伴隨著體積分?jǐn)?shù)增大，β晶粒被粗大的α片分割成許多封閉的單元，變形過程中位錯不能繞過這些粗大的α片而被限制在這些相對封閉的單元中。鑒于此，對早期時效（時效時間少于2 h）的TB3合金，結(jié)合Orowan強(qiáng)化機(jī)制及強(qiáng)度混合定律建立了其時效強(qiáng)度模型，而對于時效后期（時效時間超過2 h）試樣，結(jié)合細(xì)晶強(qiáng)化理論及強(qiáng)度混合定律建立了時效強(qiáng)度模型。這些強(qiáng)度模型的計算結(jié)果與實測值吻合

    Abstract:

    The age hardening behavior and the relevant strengthening mechanisms of Ti-10Mo-8V-1Fe-3.5Al (TB3) alloy have been investigated. A transmission electron microscope (TEM) was used to investigate the microstructures of aged and deformed TB3 specimens. It can be observed that dislocations can bypass the small α platelets in early aged samples. However, in late aged samples. the precipitated α platelets are large with high volume fraction, so that the β grains are divided into isolated β cells. In other words, the β grains are heavily refined. During plastic deformation, the dislocations generated in these β cells can not bypass the large α platelets by Orowan mechanism, but are confined within them. The strength model of the early aged TB3 alloy (aging time less than 2 h) is established by combining the law of mixtures with Orowan strengthening theory. For late aged TB3 alloy (aging time longer than 2 h), the strength model is established by combining the law of mixtures with fine grain strengthening theory. The predicated yield strength according to the modified strength models above can meet well with the measured values

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宋振亞,孫巧艷,肖 林,孫 軍,張臨財,郭嘯棟,李秀東. Age Hardening and Its Modeling of Ti-10Mo-8V-1Fe-3.5Al Alloy[J].稀有金屬材料與工程,2014,43(7):1543~1548.[Song Zhenya, Sun Qiaoyan, Xiao Lin, Sun Jun, Zhang Lincai, Guo Xiaodong, Li Xiudong. Age Hardening and Its Modeling of Ti-10Mo-8V-1Fe-3.5Al Alloy[J]. Rare Metal Materials and Engineering,2014,43(7):1543~1548.]
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  • 收稿日期:2013-07-25
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  • 在線發(fā)布日期: 2014-12-15
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