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为了利用现有的高温合金锻造设备实现TiAl合金的包套锻造,对Ti-43Al-4Nb-1Mo-0.1B合金在(α2+γ)两相区的热成形能力进行了研究.结果表明,当温度下降到(α2+γ)两相区时,合金的热成形能力明显下降,只能在1050℃以上温度以0.001 s-1的应变速率进行变形;当温度低于1050℃时,试样发生开裂;当温度升高或应变速率降低时,组织中形成更多的动态再结晶晶粒,裂纹消失.然而,当试样采用厚度为1.5 mm的不锈钢进行包套后,合金的热成形能力大大改善,可以在1050~1150℃以0.1 s-1的应变速率进行均匀变形,该变形条件更加有利于充分利用当前的工业锻造设备.同未包套试样相比,在相同变形条件下,包套试样中的动态再结晶晶粒较少.

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