纳米TiB增强TA15-N复合材料制备及力学性能研究  

Study on Preparation and Mechanical Properties of Nano-TiB Reinforced TA15-N Composites

作　　者：冯可 张洪梅[1,2] 程兴旺[1,2] 穆啸楠 孙亚男 FENG Ke;ZHANG Hongmei;CHENG Xingwang;MU Xiaonan;SUN Yanan(School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;Tangshan Research Institute,Beijing Institute of Technology,Tangshan 063000,China)

机构地区：[1]北京理工大学材料学院,北京100081 [2]北京理工大学唐山研究院,河北唐山063000

出　　处：《热加工工艺》2025年第4期147-156,共10页Hot Working Technology

基　　金：国家自然科学基金青年基金项目(52301186);国家自然科学基金面上项目(52471114);中国科协青年人才托举工程项目(2022QNRC001)。

摘　　要：以氮化硼纳米片(BN)为增强体,采用低温高压快速热压烧结和热轧工艺制备了纳米TiB(Nano-TiB)主要分布于晶内且N固溶于钛基体中的TA15基复合材料,并研究了BN含量对复合材料微观组织和力学性能的影响。结果表明,Nano-TiB的晶内分布和N的固溶主要归因于轧制前保温过程中B、N元素向钛基体的扩散。晶内分布的Nano-TiB具有优异的载荷传递、抑制断裂和促进位错累积的能力。该复合材料的力学性能主要由Nano-TiB的含量、分布位置以及N的固溶量共同决定。当BN添加量为0.025wt%时,复合材料的强塑性相比TA15基体同时提升,抗拉强度达1375.16 MPa,伸长率高达13.89%。当BN含量超过0.025wt%后,易形成Nano-TiB团聚区,导致该复合材料的塑性大幅降低。TA15-based composites with Nano-TiB distributed in grains and N dissolved in the titanium matrix were prepared by low-temperature and high-pressure sintering and hot rolling using boron nitride nanosheets(BN)as reinforcement,and the effects of BN content on the microstructure and mechanical properties of the composites were investigated.The results show that the intragranular distribution of Nano-TiB and solid dissolution of N are mainly attributed to the diffusion of B and N elements into the titanium matrix during the holding process before rolling.The intragranular distribution of Nano-TiB has excellent load transfer,inhibition of fracture and promotion of dislocation accumulation.The mechanical properties of the composites are mainly determined by the content and distribution position of Nano-TiB and the solid solution of N together.When the BN addition is 0.025wt%,the strength and plasticity of the composites are simultaneously enhanced compared with those of the TA15 matrix,and the tensile strength reaches 1375.16 MPa and the elongation is 13.89%.When the BN content exceeds 0.025wt%,it is easy to form Nano-TiB agglomerated zone,which can lead to a significant decrease in the plasticity of the composites.

关 键 词：钛基复合材料 氮化硼纳米片 快速热压烧结 

分 类 号：TB333.1[一般工业技术—材料科学与工程]