Transactions of Materials and Heat Treatment

Title：Influence of forging passes on microstructure， texture and hardness of pure tantalum

Authors： Wu Hao Jia Zhiqiang Chen Hao Zhang Long

Unit： Xi′an Noble Rare Metal Materials Co. Ltd. Xi′an 710201 China

KeyWords： pure tantalum forging pass microstructure texture Vickers hardness

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2025,50(6):42-47

Abstract：

The microstructure and texture of pure tantalum can affect the performance of tantalum target used in the electronics industry, therefore, in order to clarify the evolution characteristics of the microstructure and texture during the forging process of pure tantalum, the pure tantalum melted by electron beam was forged on a hydraulic press and then annealed at 1050 ℃. Then, the influences of forging passes (1-3 passes) on the microstructure, texture, recrystallization rate and hardness of pure tantalum were systematically investigated by backscattered diffraction and microhardness techniques. The results show that the pure tantalum has a coarse microstructure and a low recrystallization rate of only 72% after one pass forging and annealing. With the increasing of forging pass, the average recrystallized grain size of pure tantalum gradually decreases and the recrystallization rate gradually increases. After three passes forging and annealing, a strong {111}<uvw> texture is formed inside the pure tantalum, and {111} grain accounts for 39.7%. The Vickers hardness increases with the increasing of forging pass, and the average hardness value after three passes forging and annealing reaches 101.3 HV.

Funds：

国家重点研发计划（2018YFC1901704）

作者简介：吴昊（1994-），男，硕士，工程师,E-mail：1130008652@qq.com

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