Effect of duplex aging on microstructure and mechanical properties of cold-rolled nearly β titanium sheets with high strength
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摘要: 对Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe钛合金进行双级时效热处理，对比研究双级时效对高强β钛合金组织与性能的影响。时效温度选取650 ℃+450 ℃，研究结果表明双级时效处理对合金力学性能提升明显，650 ℃预时效时基体先析出较大尺寸的α相，后续的低温再时效将继续析出尺寸较小的次生α相，两种尺寸的α相共同作用下，使得双级时效的合金获得强度1504 MPa，延伸率10.3%的优良力学性能。Abstract: Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe titanium alloy was subjected to duplex aging heat treatment, and the effect of double-stage aging on the microstructure and properties of high-strength β-titanium alloy was comparatively studied. The aging temperature was 650 ℃+450 ℃. The research results show that the mechanical properties of the alloy are significantly improved by the duplex aging treatment. When pre-aging is at 650 ℃, the matrix first precipitates α phase with a larger size, and the subsequent low temperature re-aging continues to precipitate secondary α phase with a smaller size. Under the combined action of two sizes of α phase, the alloy with the duplex aging obtains excellent mechanical properties with a strength of 1504 MPa and an elongation of about 10.3%.
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Key words:
- high-strength β-titanium alloy /
- cold-rolled sheets /
- duplex aging /
- microstructure /
- α phase /
- mechanical properties
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图 3 室温拉伸试样（单位：mm）
Figure 3. Tensile specimens of the alloy for tensile test at room temperature
图 4 合金退火后在650 ℃高温预时效后SEM形貌
Figure 4. SEM images of the alloy after annealing and pre-aging at 650 ℃
图 5 合金退火后高温预时效650 ℃1～16 h XRD衍射图谱
Figure 5. XRD patterns after annealing and pre-aging at 650 ℃ for 1～16 h
图 6 合金经650 ℃/4 h +450 ℃/1～12 h降序双级时效后的SEM形貌
Figure 6. SEM images of the alloy after descending order duplex aging by descending order duplex aging at 650 ℃/4 h+450 ℃/1～12 h
图 7 合金经650 ℃/4 h+450 ℃/1～12 h降序双级时效后室温拉伸性能
Figure 7. Room-temperature tensile property of the alloy by descending order duplex aging at 650 ℃/4 h+450 ℃/1～12 h
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