Effect of Al on Microstructures and Properties of Ti-45Al-8.5Nb-0.2B-0.2W Alloy
Effect of Al on Microstructures and Properties of Ti-45Al-8.5Nb-0.2B-0.2W Alloy
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DOI：
10.4028/www.scientific.net/msf.747-748.44
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
X. Xu;Junpin Lin;Dongfei Han
中科院分区：
文献类型：
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作者：
X. Xu;Junpin Lin;Dongfei Han
本文通过对Ti-45 Al-8.5Nb-0.2B-0.2W合金中Al含量为43- 47 at.%时的凝固组织、室温压缩性能和α相变点的分析，论证了Ti-45 Al-8.5Nb-0.2B-0.2W合金中严格控制Al含量的必要性结果表明，该合金具有最佳的力学性能和显微组织的配合。Al含量的增加导致凝固组织中片层团尺寸增加，B2相减少。屈服强度随Al含量的增加而线性下降，而总应变随Al含量的增加而线性增加。当Al增加到46 at时，β + αα相变温度升高20 °C以上。%，当Al降至44at%时，温度下降约20 °C。因此，在生产工艺合金时，应尽可能减小Al偏差，以保证性能、组织和工艺路线的稳定性。
In the present paper, the necessity of strictly controlling Al content is demonstrated for Ti-45Al-8.5Nb-0.2B-0.2W alloy by analyzing solidification microstructure, compressive properties at room temperature and α phase transformation point of alloys containing 43-47at.%Al. The results show that the alloy has an optimal combination of mechanical properties and microstructure. Increasing Al content leads to increase in lamellar colony size and decrease in B2 phase for the solidification microstructure. Yield strength decreases linearly with Al content, but total strain increases linearly with Al content. The phase transformation temperature of β + αα rises more than 20 °C when Al increases to 46at. %, and drops about 20 °C when Al decreases to 44at %. Therefore, Al deviation should be as small as possible in producing technical alloy to ensure the stability in terms of properties, microstructure and processing route.