采用THERMECMASTOR-Z型热加工模拟实验机对网篮和魏氏两种片状组织TA15钛合金在α+β两相区温度750～950℃、应变速率0.001 ～10 s-1范围进行等温恒应变速率压缩实验,对压缩变形后试样进行了光学金相和透射电镜显微组织观察,并利用Jonas局部流动失稳参数预测了两种片状组织TA15钛合金的局部流动失稳行为.结果表明:两种片状组织TA15钛合金在α+β两相区低温(750 ～ 850℃)和高应变速率(0.1 ～ 10 s-1)范围变形时均会出现局部流动失稳,且局部流动失稳主要集中在原始β晶粒边界附近.当局部流动失稳参数大于5时,魏氏组织TA15钛合金会出现局部流动失稳;当局部流动失稳参数大于7时,网篮组织TA15钛合金才会出现局部流动失稳.发现用Jonas局部流动失稳参数预测合金局部流动失稳的发生还存在一定局限性.
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