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[cheyan,li shufeng,nan yingying,zhou shengyin and yang shenghui.Microstructure and mechanical properties of Ti(N)-TiBw composites prepared in situ by Ti-BN powder metallurgy[J].Rare Metal Materials and Engineering,2022,51(8):2933~2941.]
Microstructure and mechanical properties of Ti(N)-TiBw composites prepared in situ by Ti-BN powder metallurgy
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Received:July 06, 2021  Revised:July 20, 2021
DOI:
Key words: Titanium matrix composite, In situ reaction, Ostwald ripening mechanism, Grain growth kinetics, reinforcement mechanism
Foundation item:(LGG20E010004)与台州市科技项目(1902gy16)资助。
Author NameAffiliation
cheyan,li shufeng,nan yingying,zhou shengyin and yang shenghui  
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Abstract:
      In this paper, 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 ℃. 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 ℃. However, when the annealing temperature is above 1100 ℃, 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 ℃. The strength improvement is attributed to grain refinement, TiBw load transfer and O/N solution strengthening.