Ti--26Nb--4Zr 合金冷轧板材的织构和力学性能

采用 X 射线衍射和室温拉伸方法研究了冷轧变形和固溶处理对 Ti-26Nb-4Zr 合金板材的织构和力学性能的影响.研究发现,50%冷轧时形成了{001}＜uvw＞织构,随着冷变形量的增加,逐渐形成了{121}＜111＞和{001}＜110＞混合织构,＜110＞方向由与轧制方向垂直转到与轧制方向平行.800℃固溶处理后,随着变形量的增加,{111}＜110＞再结晶织构形成并逐渐增强,但＜110＞方向始终保持与轧制方向平行.由于加工硬化及晶粒细化的作用,导致随着变形量增加,冷轧板材的强度逐渐提高,塑性降低.固溶处理后,由于发生再结晶,使得板材的塑性相比冷轧态明显提高.

Texture and mechanical properties of cold-rolled Ti--26Nb--4Zr alloy plates

The effects of cold rolling and solution treatment on the texture and mechanical properties of Ti- 26Nb- 4Zr alloy plates were investigated by X-ray diffraction and tensile testing at room temperature. It is found that a {001} rolling texture appears af-ter 50% cold rolling. With increasing cold rolling reduction, a {121} <111> and {001} <110> mixed texture forms finally. The<110> direction turns from perpendicular to parallel to the rolling direction. After solution treatment at 800 ℃ , a {111}<110> recrys-tallization texture forms and its intensity increases with cold rolling reduction, while the <110> keeps parallel to the rolling direction. Due to work-hardening and refined crystal strengthening, the strength of the cold rolled plates increases while the plasticity decreases with the increase of cold rolling reduction. After solution treatment, the plasticity increases markedly because of the occurrence of re-crystallization.