The hot deformation behavior and processing map of Ti-47.5Al-Cr-V alloy
The hot deformation behavior and processing map of Ti-47.5Al-Cr-V alloy
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DOI：
10.1016/j.matdes.2015.07.027
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发表时间：
2015-12-05
影响因子：
8.4
通讯作者：
Zhang, Kaifeng
中科院分区：
文献类型：
--
作者：
Du, Zhihao;Jiang, Shaosong;Zhang, Kaifeng
采用热压缩试验研究了挤压态Ti-47.5A1-Cr-V合金在1100 ℃ ~ 1250 ℃、应变速率为0.001 s（-1）~ 1 s（-1）范围内的高温流变行为。结果表明，该合金的流变应力与应变速率呈正相关，与变形温度呈负相关。计算了该材料的活化能Q = 409 ki/mol，并建立了该材料的本构模型。将功率耗散图与失稳图相结合，建立加工图，优化变形参数。该合金的最佳变形参数为1150 ℃ ~ 1200 ℃、0.001 s（-1）~ 0.03 s（-1）。分析了不同变形条件下试样的显微组织，并与加工图相关联。材料在1 s（-1）的应变速率下发生失稳变形，与失稳图预测的结果一致。观察到的表面断裂是不稳定性的鉴定。(C)2015爱思唯尔有限公司版权所有。
The high temperature flow behavior of as-extruded Ti-47.5A1-Cr-V alloy has been investigated at the temperature between 1100 degrees C and 1250 degrees C and the strain rate range from 0.001 s(-1) to I s(-1) by hot compression tests. The results showed that the flow stress of this alloy had a positive dependence on strain rate and a negative dependence on deformation temperature. The activation energy Qwas calculated to be 409 ki/mol and the constitutive model of this material was established. By combining the power dissipation map with instability map, the processing map was.established to optimize the deformation parameters. The optimum deformation parameter was at 1150 degrees C-1200 degrees C and 0.001 s(-1)-0.03 s(-1) this alloy. The microstructure of specimens deformed at different conditions was analyzed and connected with the processing map. The material underwent instability deformation at the strain rate of 1 s(-1), which was predicted by the instability map. The surface fracture was observed to be the identification of the instability. (C) 2015 Elsevier Ltd. All rights reserved.