文章信息/Info

Title:

Effects of Microstructure on the Quasi-Static and Dynamic Compression Properties of TC21 Titanium Alloy

作者:

楊紅斌; 李萌蘗; 卜恒勇

昆明理工大學材料科學與工程學院

Author(s):

YANG Hongbin;  LI Mengnie;  BU Hengyong

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

關鍵詞:

TC21鈦合金; 微觀組織; 準靜態和動態; 壓縮性能

Keywords:

TC21 titanium alloy;  microstructure;  quasi-static and dynamic;  compression properties

文獻標志碼:

A

摘要:

TC21鈦合金經不同工藝熱處理后，獲得了等軸組織、雙態組織和片層組織，通過萬能材料試驗機及分離式Hopkinson壓桿，分別對3種組織試樣進行壓縮試驗，研究微觀組織對TC21鈦合金準靜態和動態壓縮性能的影響。結果表明，三者的準靜態壓縮性能各不相同，等軸組織塑性最好，但其強度低；雙態組織強度較高，斷裂應變卻較差；片層組織具有較好的強塑性匹配。三者的動態壓縮性能也存在差異，在1500~3200 s-1應變率壓縮下，等軸組織的動態流變應力較低，但其動態塑性應變較好，具有較好的抗沖擊性能；雙態組織有著較高的流變應力，但其抗沖擊性能較差；片層組織表現出較高的流變應力同時抗沖擊性能好，為三者中動態力學性能匹配最佳。

Abstract:

Three different microstructures of TC21 titanium alloys, including equiaxed, binary and lamellar microstructure, were obtained after different heat�瞭reatments. The effects of microstructure on the quasi�瞫tatic and dynamic compression properties were studied and analyzed by using compression tests. The results showed that, different microstructure presented different quasi�瞫tatic and dynamic compression performances. The equiaxed microstructure had a higher plasticity, but lower strength. Binary microstructure had a better strength, but poor plasticity. Lamellar microstructure had a relatively better plasticity and strength. At the strain rate about 1500~3200 s-1, the equiaxed microstructure had a lower flow stress, but higher dynamic plastic strain and impact resistance. Binary microstructure had a higher flow stress, but poor impact resistance. Lamellar microstructure showed higher flow stress and impact resistance, which indicated the lamellar microstructure had a better comprehensive performance in the three kinds of microstructure.