4.3 Article

Microstructure and Mechanical Properties of Ti(N)-TiBw Composites Prepared in situ by Ti-BN Powder Metallurgy

期刊

RARE METAL MATERIALS AND ENGINEERING
卷 51, 期 8, 页码 2933-2941

出版社

NORTHWEST INST NONFERROUS METAL RESEARCH

关键词

titanium matrix composite; in situ reaction; Ostwald ripening mechanism; grain growth kinetics; reinforcement mechanism

向作者/读者索取更多资源

Ti(N)-TiBw composites were prepared by spark plasma sintering (SPS) and the effect of annealing temperature on their microstructure and mechanical properties was investigated. The results showed that dense composites with high tensile strength could be obtained at 1000 degrees C.
Ti(N)-TiBw composites were prepared by spark plasma sintering (SPS) with pure Ti powder and BN powder as raw materials. The effect of annealing temperature on microstructure evolution and mechanical properties of Ti(N)-TiBw composites was studied. Results show that Ti and BN react in situ to form dense TiBw and N solution strengthened titanium matrix composites when sintered at 1000 degrees C. TiBw is distributed in the primary particle boundary in the form of needle like network. With the increase of heat treatment temperature, the aspect ratio of TiBw first increases and then decreases, reaching the maximum at 1100 degrees C. However, when the annealing temperature is above 1100 degrees C, TiBw coarsens gradually, and the microstructure changes from needle shape to short rod shape. The pinning effect of TiBw on the matrix is obviously weakened, and the grain size of Ti matrix coarsens gradually. The morphology evolution of TiBw follows Ostwald ripening mechanism. As the heat treatment temperature increases, the ultimate tensile strength of the composites first increases and then decreases, reaching a maximum value of 908 MPa at 1000 degrees C. The strength improvement is attributed to grain refinement, TiBw load transfer and O/N solution strengthening.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.3
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据