Effect of heat treatment on microstructure and properties of Ti84Al11FeMo4 titanium alloy
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摘要: 通过d电子理论设计出新型两相钛合金Ti84Al11FeMo4，分析了物相组成随温度的变化关系。结合热力学计算结果，分别研究了700、770 ℃以及850 ℃不同时效温度下钛合金的微观组织与力学性能的演化关系。结果表明，随着时效处理温度的提高，Ti84Al11FeMo4钛合金微观组织中β相的含量逐渐增多。当时效温度增加到850 ℃时，β析出相的含量最多，且在粗β相间分布着大量细小尺寸的β相。Ti84Al11FeMo4钛合金经不同时效温度处理后表现出不同的力学性能，在700 ℃和770 ℃下时效处理后可显著提高钛合金的压缩强度，而在850 ℃下时效后可以实现钛合金的强度和塑性的同步提升。
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关键词:
- 钛合金 /
- Ti84Al11FeMo4 /
- 热处理 /
- 强度 /
- 塑性
Abstract: A novel two-phase titanium alloy of Ti84Al11FeMo4 was designed based on d-electron theory and the phase composition as a function of temperature was analyzed. Combined with the thermodynamic calculation results, the evolution relationship between the microstructure and mechanical properties of titanium alloys at different aging temperatures of 700 ℃, 770 ℃ and 850 ℃ was studied, respectively. The results show that the amount of β phase in the microstructure of Ti84Al11FeMo4 titanium alloy gradually increases with the increase of aging temperature. When the aging temperature is increased to 850 ℃, the amount of β precipitates reaches the maximum, and a large number of small-sized β phases are distributed among the coarse β phases. Ti84Al11FeMo4 titanium alloy exhibits different mechanical properties after aging treatment at different temperatures. The compressive strength of titanium alloy could be significantly improved after aging at 700 ℃ and 770 ℃, while the high strength and ductility could be simultaneously obtained after aging at 850 ℃.-
Key words:
- titanium alloy /
- Ti84Al11FeMo4 /
- heat treatment /
- strength /
- ductility
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图 1 Ti84Al11FeMo4合金的热力学计算相图
Figure 1. Calculated thermodynamic phase diagram of Ti84Al11FeMo4 alloy
图 2 Ti84Al11FeMo4合金在不同时效温度下的微观形貌
(a) 铸态；(b)样品1； (c) 样品2 ； (d) 样品3
Figure 2. Micromorphology of Ti84Al11FeMo4 alloy obtained at different aging temperatures
图 3 Ti84Al11FeMo4合金中合金元素在两相中的分布情况
Figure 3. Distribution of alloying elements in two phases in Ti84Al11FeMo4 alloy
图 4 Ti84Al11FeMo4合金在不同时效温度下的应力应变曲线
Figure 4. Stress-strain curves of Ti84Al11FeMo4 alloy obtained at different aging temperatures
图 5 Ti84Al11FeMo4合金在不同时效温度下的断口形貌
(a) 铸态；(b)样品1；(c) 样品2；(d) 样品3
Figure 5. Fracture morphologies of Ti84Al11FeMo4 alloy obtained at different aging temperatures
表 1 Ti中不同元素Bo、Md参数值
Table 1. Bo and Md parameter values of different elements in Ti alloy
元素 Bo Md Ti 3.513 2.447 Fe 3.428 0.969 Al 3.297 2.2 Mo 3.759 1.961 
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表 2 热处理制度及热力学理论物相组成
Table 2. Heat treatment system and thermodynamic theory phase composition
序号 固溶温度/℃ 时效温度/℃ 物相组成/% α-Ti β-Ti 样品1 950+WQ 700+WQ 65 35 样品2 950+WQ 770+WQ 50 50 样品3 950+WQ 850+WQ 20 80 注：WQ表示水冷。
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表 3 不同时效温度下Ti84Al11FeMo4合金压缩强度和断裂塑性
Table 3. Compressive strength and fracture ductility of Ti84Al11FeMo4 alloy obtained at different aging temperatures
样品 压缩强度/MPa 断裂塑性/% 铸态 1366 20 样品1 1712 22 样品2 1695 18.9 样品3 1558 24
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