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High-temperature plastic deformation behaviour of powder metallurgy Ti6Al4V alloy prepared from HDH powder
Powder Metallurgy ( IF 1.9 ) Pub Date : 2021-01-15 , DOI: 10.1080/00325899.2021.1873531
Haiying Wang 1 , Fang Yang 1, 2, 3 , Boxin Lu 1 , Cunguang Chen 1, 2, 3 , Zhimeng Guo 1, 2, 3
Affiliation  

ABSTRACT

Powder metallurgy (PM) Ti6Al4V alloy was prepared from HDH alloy powder by vacuum pressureless sintering. To study its high-temperature deformation behaviour, isothermal compression testing was carried out with temperature range of 900–1050°C, strain rate range of 0.01–10 s−1, and compression ratio of 60%. Based on the hot deformation data, the corresponding constitutive equation and hot processing map were clarified. The deformation activation energy for PM Ti6Al4V alloy was 606.5 kJ mol−1. Its deformation instability zone was very small, locating in the range of 960∼990°C with strain rate >1 s−1. PM Ti6Al4V alloy had large hot working window and good hot workability. The ideal hot processing domain was at 970–990°C and 0.05–0.01 s−1. Besides, the domain at 1000–1040°C and 1–10 s−1 was also suitable for hot processing. This study proposed an effective guidance for the hot deformation (e.g. forging, extrusion, rolling) of PM Ti6Al4V alloy.



中文翻译:

HDH粉制备粉末冶金Ti6Al4V合金的高温塑性变形行为

摘要

粉末冶金(PM)Ti6Al4V合金是由HDH合金粉末通过真空无压烧结制备的。为了研究其高温变形行为,进行了等温压缩试验,温度范围为 900-1050°C,应变速率范围为 0.01-10 s -1,压缩比为 60%。根据热变形数据,明确了相应的本构方程和热加工图。PM Ti6Al4V 合金的变形活化能为606.5 kJ mol -1。其变形不稳定区很小,位于960~990℃范围内,应变速率>1 s -1。PM Ti6Al4V合金具有较大的热加工窗口和良好的热加工性。理想的热加工域为 970–990°C 和 0.05–0.01 s -1. 此外,1000-1040°C 和 1-10 s -1 的区域也适合热加工。该研究为PM Ti6Al4V合金的热变形(如锻造、挤压、轧制)提供了有效的指导。

更新日期:2021-01-15
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