Effects of degree of deformation on the microstructure, mechanical properties and texture of hybrid-reinforced titanium matrix composites

详细信息	查看全文 | 推荐本文 |

• 作者：Xianglong Guo ; Liqiang Wang ; Minmin Wang ; Jining Qin ; Di Zhang ; Weijie Lu ; ^{luweijie@sjtu.edu.cn}
• 关键词：Titanium matrix composites ; Deformation degree ; Tensile properties ; Modeling ; Texture
• 刊名：Acta Materialia
• 出版年：2012
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：April, 2012
• 卷：60
• 期：6-7
• 页码：2656-2667
• 文件大小：1855 K

摘要

Titanium matrix composites reinforced by TiB whiskers and La₂O₃ particles are synthesized in a consumable vacuum arc remelting furnace by an in situ technique based on the reaction between Ti, LaB₆ and oxygen in the raw material. The titanium matrix composites are hot rolled with degrees of deformation of 60%, 80%, 90%and 95%. The effects of the hot rolling degree of deformation on the mechanical properties of the composites are investigated by experiment and modeling. In particular, the variation in the inclination of the TiB whiskers during rolling is quantified in the model. The results show that, with increasing degree of deformation, the mechanical properties of composites are improved. Modeling of the mechanical properties reveals that grain refinement and TiB whisker rotation during rolling contribute to the improvement in the yield strength of the titanium matrix composites. Electron backscatter diffraction and transmission electron microscopy observations are used to study the texture of the composites. It is found that the orientation relationships between Ti matrix and TiB whiskers are [1 1 鈭? 0]_Ti || [0 1 0]_TiB, (0 0 0 1)_Ti || (0 0 1)_TiB and (1 鈭? 0 0)_Ti || (1 0 0)_TiB. TiB whiskers rotate in the rolling direction (RD) with increasing degree of deformation, which results in a higher intensity [1 1 鈭? 0]_Ti || RD fiber due to the special orientation relationship between TiB and the Ti matrix.