Phase transformation mechanism of Ti-6Al-4V titanium alloy induced by tensile deformation
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摘要: 钛合金中的相转变行为对材料的塑性变形以及力学性能起到至关重要的影响。因此，有必要深入研究钛合金的相转变行为，并在此基础上揭示相转变的机制。采用一种新颖的热处理工艺成功在Ti-6Al-4V钛合金中引入细β晶马氏体组织。发现在拉伸载荷条件下存在变形诱导HCP相向FCC相转变的行为，并揭示了相转变机制。HCP相与新形成的FCC相之间满足晶体学取向关系：(0002)HCP || $({11\bar 1 })$FCC以及$< {2\bar 1\bar 10}>$HCP || <011>FCC。通过两相之间的晶体学取向关系提出相转变机制：HCP相(0001)晶面上每两个原子层之间的一个1/3$< {10\bar 10}>$肖克莱不全位错滑移。通过第一性原理计算HCP相向FCC相转变过程中(0001)$< {10\bar 10}>$层错能变化,成功验证了该相转变机制。
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关键词:
- Ti-6Al-4V钛合金 /
- 拉伸变形 /
- 马氏体 /
- FCC相转变
Abstract: Phase transition behavior plays a crucial role on the plastic deformation and mechanical properties of titanium alloy. Therefore, it is very necessary to study the phase transition behavior and further reveal the corresponding mechanism of titanium alloy. In this paper, a novel heat treatment process was successfully used to introduce a fine β grain martensite structure into Ti-6Al-4V titanium alloy. Deformation-induced HCP phase to FCC phase transition behavior under tensile loading conditions was discovered, and the corresponding phase transition mechanism was revealed. The crystallographic orientation relationship between the HCP phase and the newly formed FCC phase is: (0002)HCP || $(11\bar1 )$FCC and $<2\bar1\bar10 >$HCP || <011> FCC. The phase transition mechanism is proposed based on the crystallographic orientation relationship between the two phases: 1/3$<10\bar10 > $ type Shockley partial dislocations slip on every two (0001) atomic basal planes. This phase transition mechanism was further verified by first principles that calculated the change of (0001)$<10\bar10 >$ stacking fault energy during HCP to FCC phase transition.-
Key words:
- Ti-6Al-4V titanium alloy /
- tensile deformation /
- martensite /
- FCC phase transition
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图 2 合金经DIL 805A/D相变仪热处理后的组织
Figure 2. Microstructures of the alloy after heat treatment by the DIL 805A/D dilatometer
(a) 1 s； (b) 7 s； (c) 60 s； (d) 1 800 s
图 4 不同β晶粒大小的合金拉伸变形过程中TEM形貌及相应选区电子衍射花样
Figure 4. TEM morphologies and the corresponding diffraction patterns of the selected area in alloy with different β grain sizes
(a)(b) 25 μm；(c)(d) 131 μm；(e)(f) 375 μm
图 5 拉伸变形诱导的B类FCC相转变
Figure 5. Tensile deformation induced by B type FCC phase transformation
图 6 HCP相向FCC相转变机制示意
Figure 6. Schematic diagram of HCP to FCC phase transformation mechanism
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