(TiB+La2O3)/IMI834钛基复合材料超塑性变形行为及显微组织演变
Superplastic Deformation Behavior and Microstructure Evolution of(TiB+La2O3)/IMI834 Titanium-Based Composite
摘 要
对（TiB+La2O3）/IMI834钛基复合材料进行超塑性变形，研究了不同温度（850，900，950，1 000 ℃）和初始应变速率（0.000 5，0.001 0，0.005 0 s-1）对其超塑性变形行为及显微组织的影响。结果表明：该复合材料由α-Ti、TiB、La2O3相及弥散分布的（TiZr）xSi颗粒组成；复合材料具有较好的超塑性，在900 ℃、0.001 0 s-1条件下，断后伸长率最大，为505%；复合材料的应变速率敏感系数高于0.30，随应变速率增加，流变应力和变形激活能增大；随变形程度增加，复合材料中片层α相逐渐等轴化，小角度晶界向大角度晶界转变，但孔洞缺陷增多；晶界滑动、晶粒转动和动态再结晶是（TiB+La2O3）/IMI834钛基复合材料超塑性变形的主要变形机制。
超塑性变形
电子背散射衍射
组织演变
titanium-based composite material
superplastic deformation
electron backscatter diffraction
microstructure evolution
Abstract
Superplastic deformation of (TiB+La2O3)/IMI834 titanium-based composite was carried out. The effects of different temperatures (850, 900, 950, 1 000 ℃) and initial strain rates (0.000 5, 0.001 0, 0.005 0 s-1) on its superplastic deformation behavior and microstructure were studied. The results show that the composite was composed of α-Ti, TiB, La2O3 and dispersed (TiZr)xSi particles. The composite exhibited perfect superplasticity, and showed the largest elongation of 505% at 900 ℃ and 0.001 0 s-1. The strain rate sensitivity coefficient of the composite was higher than 0.30. The flow stress and deformation activation energy increased with the strain rate. With the increase of the deformation degree, the α phase of lamellar layer was gradually equiaxed, the small-angle grain boundary changed to the high-angle grain boundary, while the hole defects increased. Grain boundary sliding, grain rotation and dynamic recrystallization were the main deformation mechanisms of the superplastic deformation of (TiB+La2O3)/IMI834 titanium-based composite.
中图分类号 TG146.23 DOI 10.11973/jxgccl202008007
所属栏目 试验研究
基金项目 浙江领军型创业团队资助项目（2017R02003）
收稿日期 2020/3/9
修改稿日期 2020/7/2
网络出版日期
作者单位点击查看
备注来晓君(1971-),女,陕西高陵人,硕士
引用该论文: LAI Xiaojun,QIU Peikun,Lü Weijie,HAN Yuanfei. Superplastic Deformation Behavior and Microstructure Evolution of(TiB+La2O3)/IMI834 Titanium-Based Composite[J]. Materials for mechancial engineering, 2020, 44(8): 32～37
来晓君,邱培坤,吕维洁,韩远飞. (TiB+La2O3)/IMI834钛基复合材料超塑性变形行为及显微组织演变[J]. 机械工程材料, 2020, 44(8): 32～37
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【15】肖旅. 原位自生耐热钛基复合材料的高温性能研究[D]. 上海: 上海交通大学, 2010.
【16】郭相龙. 变形量对(TiB+La2O3)/Ti复合材料组织结构及力学性能影响的研究[D]. 上海: 上海交通大学, 2013.
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