Effects of degree of deformation on the microstructure, mechanical properties and texture of hybrid-reinforced titanium matrix composites
Effects of degree of deformation on the microstructure, mechanical properties and texture of hybrid-reinforced titanium matrix composites
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DOI：
10.1016/j.actamat.2012.01.032
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发表时间：
2012-04-01
期刊：
影响因子：
9.4
通讯作者：
Lu, Weijie
中科院分区：
文献类型：
--
作者：
Guo, Xianglong;Wang, Liqiang;Lu, Weijie
利用Ti、LaB 6与原料中的氧反应，在自耗真空电弧炉中原位合成了TiB晶须和La 2 O3颗粒增强的钛基复合材料。对钛基复合材料进行了60%、80%、90%和95%的热轧变形。通过实验和模拟研究了热轧变形量对复合材料力学性能的影响。特别是，在轧制过程中的TiB晶须的倾斜度的变化是量化的模型。结果表明，随着变形量的增加，复合材料的力学性能提高。力学性能的建模表明，晶粒细化和TiB晶须旋转轧制过程中的钛基复合材料的屈服强度的改善。电子背散射衍射和透射电子显微镜观察用于研究复合材料的织构。结果表明，Ti基体与TiB晶须的取向关系为[1 - 1 -20]（Ti）平行于[0 1 0]（TiB），（0 0 0 1）（Ti）平行于（0 0 1）（TiB），（1-1 0 0）（Ti）平行于（1 0 0）（TiB）。随着变形程度的增加，TiB晶须沿轧制方向（RD）旋转，由于TiB和Ti基体之间的特殊取向关系，导致平行于RD纤维的强度较高[11-20]（Ti）。(C)2012 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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 [11-20](Ti) parallel to [0 1 0](TiB), (0 0 0 1)(Ti) parallel to (0 0 1)(TiB) and (1-1 0 0)(Ti) parallel to(1 0 0)(TiB). TiB whiskers rotate in the rolling direction (RD) with increasing degree of deformation, which results in a higher intensity [11-20](Ti) parallel to RD fiber due to the special orientation relationship between TiB and the Ti matrix. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.