新聞資訊
中溫旋鍛變形Ti2448合金的顯微組織及力學性能
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-07
采用XRD、TEM等手段對Ti-24Nb-4Zr-8Sn(質量分數，%)合金中溫旋鍛變形后的顯微組織進行研究。
中溫旋鍛變形Ti2448合金的顯微組織及力學性能Microstructure and mechanical properties of?warm-swaged Ti2448 alloy
采用XRD、TEM等手段對Ti-24Nb-4Zr-8Sn(質量分數，%)合金中溫旋鍛變形后的顯微組織進行研究。結果表明，經過較大的中溫變形后，合金呈旋渦狀大理石花紋組織且具有與旋鍛軸向平行的強烈的á110?絲織構，這種典型的組織是由于具有á110?取向的晶粒在軸向拉應力狀態下發生平面應變所致。TEM分析顯示組織中含有高密度的小角晶界，應變分布不均勻。旋鍛變形后，合金具有3.3%的超彈性變形和微弱的加工硬化行為。由于變形組織中留有大量的分布不均勻的殘余應力，合金的塑性較差，在600 ℃下5 min去應力退火處理后，合金的塑性增強。
The warm-swaged structure of Ti-24Nb-4Zr-8Sn (mass fraction, %) was studied by XRD and TEM. The results show that the warm-swaged alloy presents a swirled marble-like structure and has a pronounced fibrous á110? texture along the swaging axis. This typical swirled structure forms owing to the planar strain deformation of the á110?-textured grains. According to the TEM observation, there are high densities of low angle grain boundaries, dislocations and asymmetric strain in the deformed structure. The warm-swaged alloy characterizes as prominent non-liner elasticity, 3.3% recoverable elastic strain, and trivial work hardening behavior. Due to the large and asymmetric strain, the plasticity of the deformed alloy is deteriorated, which can be improved after 5 min heat treatment at 600 ℃.
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