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中文摘要：
为了通过组织设计获得优异的性能,揭示TA15钛合金三态组织中的2种片层α相（次生片层α和转变β基体中细α条）的演化至关重要。采用等温压缩（在950,965和975℃）,结合双重热处理（在压缩温度以下10~40℃进行第1次热处理,然后在810°C进行第2次热处理）,研究了2种片层α相的演化规律。结果表明,在低于等温压缩温度以下10℃进行第1次热处理,可以获得单独分布的厚片层α相和细α条,这种细α条在第1次热处理后空冷具有集束的形态,而在第1次热处理后水冷具有针状形态。在低于等温压缩温度以下25℃进行第1次热处理,可以获得集束和网篮状的片层α相以及细α条。在低于等温压缩温度以下40℃进行第1次热处理,只能获得集束和网篮状的片层α相。另外,在第1次热处理温度相同的条件下,不同冷却方式对次生片层α相的形态影响较小。
英文摘要：
It is critical to reveal the evolution rules of two types of α platelets（secondary lamellar α and thin α lath in transformed β matrix） in the tri-modal microstructure of TA15 alloy so as to obtain exceptional properties through microstructural design. The combined effects of isothermal compression（at 950, 965, and 975 °C） and subsequent double heat treatments（a high-temperature heat treatment at 10 °C to 40 °C below the compression temperature followed by a 810 °C heat treatment） on the evolution of the two types of α platelets were studied. The results show that the isolated lamellar α and the thin α lath can be produced by first heat treatment at 10 °C below the compression temperature and the thin α lath in this structure has a colony morphology under air cooling and an acicular morphology under water quenching. Colony and basketweave lamellar α and thin α lath can be produced when the first heat treatment is at 25 °C below the compression temperature. Only the colony and basketweave lamellar α can be produced when the first heat treatment temperature is 40 °C lower than the compression temperature. Besides, the morphology of lamellar α is not substantially influenced by cooling modes after the first heat treatment at the same temperatures.
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