Study on the hydride precipitation orientation in Ti-2Al-2.5Zr titanium alloy
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摘要: 研究了含氢量对Ti-2Al-2.5Zr钛合金微观组织以及氢化物析出取向的影响。结果显示，高温气相充氢（质量分数）0.01%、0.05%后，合金内部形成了δ-氢化物。随着含氢量的增加，氢化物尺寸和密度逐渐增加。α-Ti/δ-氢化物具有{0001}α//{${1 \bar {1}1} $}δ， <$ {1\bar {2}10} $>α//<110>δ取向关系。氢化物析出导致的晶格膨胀会使得周边α-Ti基体和氢化物内部形成大量的位错，其尖端处的应力可穿过晶界，并诱导相邻晶粒内部形成氢化物。
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关键词:
- Ti-2Al-2.5Zr钛合金 /
- 气相渗氢 /
- δ-氢化物 /
- 微观组织
Abstract: In this paper, the effects of hydrogen content on the microstructure and hydride precipitation orientation in Ti-2Al-2.5Zr titanium alloy were investigated. The results showed that after high-temperature gas-phase hydrogen charging (mass fraction: 0.01%、0.05%), δ-phase hydrides were formed within the alloy matrix. With the increase of hydrogen content, the size and density of hydrides gradually increased. The hydrides exhibited an orientation relationship of {0001}α//{$ {1\bar {1} 1}$}δ, <$ {1\bar {2}10} $>α//<110>δ. Lattice expansion caused by hydride precipitation generated numerous dislocations in both the surrounding α-Ti matrix and the hydrides themselves and the stress at the hydride tips could transmit across grain boundaries and induce hydride formation in adjacent grains. -
图 1 不同含氢量下Ti-2Al-2.5Zr合金XRD图谱
Figure 1. XRD patterns of Ti-2Al-2.5Zr alloy with different hydrogen contents
图 2 不同含氢量下Ti-2Al-2.5Zr合金金相图
（a）初始态；（c）含氢量0.01%；（d）含氢量0.05%
Figure 2. Metallographic images of Ti-2Al-2.5Zr alloy under different hydrogen contents
图 3 0.05%含氢量下Ti-2Al-2.5Zr钛合金的反极图与氢化物惯习面分析
(a)IPF图；(b)～(f)IPF图中晶粒1～5及其内部氢化物极图
Figure 3. Inverse pole figure (IPF) and hydride habit plane analysis of the Ti-2Al-2.5Zr titanium alloy specimen with 0.05% hydrogen content
图 4 0.05%含氢量下Ti-2Al-2.5Zr钛合金微观形貌
(a)氢化物微观形貌图；(b) 氢化物内部和附近微区位错组态
Figure 4. Microstructural features of Ti-2Al-2.5Zr titanium alloy with 0.05% hydrogen content
表 1 Ti-2Al-2.5Zr钛合金名义化学成分
Table 1. The nominal chemical composition of Ti-2Al-2.5Zr titanium alloy
% C H O N Al Zr Ti ≤0.01 ≤0.005 ≤0.07 ≤0.006 1.8～2.5 2～3 Bal. 
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