Characterization of hot processing parameters of powder metallurgy TiAl-based alloy based on the activation energy map and processing map
作者： Yu Sun , Zhipeng Wan , Lianxi Hu , Junshuai Ren
DOI: 10.1016/J.MATDES.2015.07.140
关键词:
摘要: Abstract The hot deformation behavior of powder metallurgy Ti–47Al–2Nb–2Cr alloy was studied by using the activation energy map and processing in this work. isothermal compression tests were performed over a range temperatures 950–1200 °C strain rates 0.001–0.1 s − 1 on Gleeble-1500D working simulator. flow softening stress discussed. variation calculated Q value with parameters has been presented, it found that increases increasing temperature rate whole. Based constructed maps, optimal window corresponds to 1025–1075 °C low 0.001–0.004 s , peak efficiency 55% at 1050 °C/0.001 s . Meanwhile, instability maps developed help comparison between Murty Prasad criteria. domain should be kept away is located high higher than 0.01 s for whole temperature. Both process conditions predominant mechanism PM TiAl-based validated microstructure observation involving DRX refined cracking, respectively.
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