(Ti,Zr)_(5)Si_(3)/TA19(C,N)复合材料组织与力学性能研究  

Structure and Mechanical Properties of(Ti,Zr)_(5)Si_(3)/TA19(C,N)Composites

作　　者：任嘉腾 李鹏远 冯雪艳 徐俊杰 REN Jiateng;LI Pengyuan;FENG Xueyan;XU Junjie(Xi’an Rare Metal Materials Institute Co.,Ltd.,Xi’an 710016,China;School of Materials Science and Engineering,Xi’an University of Science and Technology,Xi'an 710054,China;School of Materials Science and Engineering,Xi'an Shiyou University,Xi’an 710065,China;Shaanxi TCAE Advanced Materials Lab Co.,Ltd,Xianyang 712023)

机构地区：[1]西安稀有金属材料研究院有限公司,陕西西安710016 [2]西安科技大学材料科学与工程学院,陕西西安710054 [3]西安石油大学材料科学与工程学院,陕西西安710065 [4]陕西天成先进材料实验室有限公司,陕西咸阳712023

出　　处：《铜业工程》2025年第1期112-124,共13页Copper Engineering

基　　金：国家自然科学基金项目(52271138);陕西省重点研发计划一般项目(2023-YBGY-433)资助。

摘　　要：采用低能机械球磨与放电等离子烧结技术制备了(Ti,Zr)_(5)Si_(3)/TA19(C,N)复合材料,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、电子探针(EPMA)、电子万能实验机研究了(Ti,Zr)_(5)Si_(3)/TA19(C,N)复合材料的组织结构与力学性能。结果表明:随着增强相含量的增加,(Ti,Zr)_(5)Si_(3)/TA19(C,N)复合材料晶粒逐渐细化,当石墨相氮化碳(C_(3) N_(4))添加量达0.7%(质量分数)时,α片层厚度明显增加,基体由魏氏组织向近等轴状组织转变,α相由片层状向短棒状转变。室温下,当Si与C_(3) N_(4)添加量分别为0.3%与0.2%时,(Ti,Zr)_(5)Si_(3)/TA19(C,N)复合材料达到了良好的强塑性匹配,其抗拉强度达(1280.3±14)MPa,相对于TA19钛合金提升了15.6%,此时断裂延伸率仍保持4.8%±0.6%。随着增强相含量的增加,硅化物在基体内析出,分布于α/β相界处,对基体组织起到了钉扎作用。此外,C和N元素的间隙固溶也有效提高了复合材料的强度,但过多的C和N元素也会严重损害复合材料的塑性,从而导致在室温条件下断裂延伸率大幅度下降。(Ti,Zr)_(5)Si_(3)/TA19(C,N)复合材料力学性能的提高主要归因于晶粒细化、固溶强化与第二相强化。In this paper,(Ti,Zr)_(5)Si_(3)/TA19(C,N)composites were fabricated via low-energy mechanical milling and spark plasma sintering.The microstructure and mechanical properties of(Ti,Zr)_(5)Si_(3)/TA19(C,N)composites were systematically studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),electron probe micro-analysis(EPMA)and electronic universal testing machine.The results showed that the grains of(Ti,Zr)_(5)Si_(3)/TA19(C,N)composites were gradually refined with the increase in the content of the reinforcing phase.When the content of graphite phase carbon nitride(C_(3)N_(4))reached 0.7%(mass fraction),the thickness ofαlamellae increased obviously,the matrix changed from widmanstatten structure to near-equiaxed structure,andαphase changed from lamellar structure to short rod structure.At room temperature,when the addition of Si and C_(3)N_(4) was 0.3%and 0.2%,respectively,(Ti,Zr)_(5)Si_(3)/TA19(C,N)composite achieved a good combination of strength and plasticity,and its tensile strength reached(1280.3±14)MPa,which was 15.6%higher than that of TA19 alloy.At this point,the fracture elongation remained 4.8%±0.6%.With the increase in the content of the reinforcing phase,the silicide precipitated in the matrix and distributed atα/βphase boundary,which played a pinning role in the matrix structure.In addition,the interstitial solid solution of C and N elements also effectively improved the strength of the composites,but excessive C and N elements would seriously damage the plasticity of the composites,resulting in a significant decrease in the elongation at break at room temperature.The improvement in mechanical properties of the composites of composites was mainly attributed to grain refinement,solid solution strengthening and second phase strengthening.

关 键 词：钛基复合材料 放电等离子烧结 固溶强化 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]