汪佳,刘伟,束国刚,李丘林.Al2O3/ TiB2/Al学性能复合材料的微观结构和高温力学性能[J].稀有金属材料与工程,2021,50(3):787~794.[Wang Jia,Liu Wei,Shu Guogang,Li Qiulin.Microstructure and elevated temperature mechanical properties of Al2O3/ TiB2/Al composites[J].Rare Metal Materials and Engineering,2021,50(3):787~794.]
Al2O3/ TiB2/Al学性能复合材料的微观结构和高温力学性能
投稿时间:2020-02-19  修订日期:2020-03-05
中文关键词:  TiB[sub_s]2[sub_e]/Al复合材料  纳米Al[sub_s]2[sub_e]O[sub_s]3[sub_e]  高温性能  断裂
基金项目:广东省重点领域研发计划(项目编号2019B121204005)
中文摘要:
      以细雾化铝粉和TiB2颗粒为原料,通过粉末冶金和热轧制制备微米TiB2和纳米Al2O3颗粒增强铝基复合材料。室温时,由于TiB2和Al2O3的综合强化作用,Al2O3/TiB2/Al复合材料的屈服强度和抗拉强度分别为258.7MPa和279.3MPa,测试温度升至350℃时,TiB2颗粒的增强效果显著减弱,原位纳米Al2O3颗粒与位错的交互作用使得复合材料的屈服强度和抗拉强度达到98.2MPa和122.5MPa。在350℃退火1000h后,由于纳米Al2O3对晶界的钉扎作用抑制晶粒长大,强度和硬度未发生显著的降低。随着测试温度上升,复合材料的主要断裂机制从TiB2颗粒断裂向颗粒与基体的界面解离转变。
Microstructure and elevated temperature mechanical properties of Al2O3/ TiB2/Al composites
英文关键词:TiB2/Al composites  nano-Al2O3 particles  elevated temperature properties  fracture
英文摘要:
      Aluminum matrix composites reinforced with micro-TiB2 and nano-Al2O3 particles were successfully fabricated by combining powder metallurgy and hot rolling with raw materials of fine atomized aluminum powders and TiB2 particles. The Al2O3/TiB2/Al composites exhibited a yield strength of 258.7 MPa and an ultimate tensile strength of 279.3 MPa at 25 °C due to the comprehensive strengthening effect of TiB2 and Al2O3 particles. The strengthening effect of TiB2 particles was significantly weakened with temperature rising to 350 ℃, and the Orowan strengthening mechanism between nano-Al2O3 and dislocation made the yield strength and tensile strength of the composite material reach 98.2MPa and 122.5MPa. After annealing at 350 ℃ for 1000h, due to the pinning effect of nano-Al2O3 on grain boundaries, the grains growth were suppressed significantly and the strength and hardness did not decrease significantly. The main fracture mechanism of composites changed from brittle TiB2 particle fracture to interface debonding between TiB2 and the matrix from room temperature to elevated temperature.
作者单位E-mail
汪佳 清华大学深圳国际研究生院 wangjia17@mails.tsinghua.edu.cn 
刘伟 School of Materials Science and Engineering,Tsinghua University  
束国刚 State Key Laboratory of Nuclear Powder Engineering CoLtd  
李丘林 清华大学深圳国际研究生院 liql@sz.tsinghua.edu.cn 
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