Ti-34Nb-4Zr-0.3O合金时效组织调控及其力学性能  

Microstructure regulation and mechanical properties of Ti-34Nb-4Zr-0.3O alloys by aging

作　　者：齐欢 武祥为 张涵雅 陈锋[1,2] 王玉会 王春阳 QI Huan;WU Xiangwei;ZHANG Hanya;CHEN Feng;WANG Yuhui;WANG Chunyang(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Jiangsu Key Laboratory of Advanced Metallic Materials,Southeast University,Nanjing 211189,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省先进金属材料高技术研究重点实验室,南京211189 [3]中国航发北京航空材料研究院,北京100095

出　　处：《材料工程》2024年第4期102-109,共8页Journal of Materials Engineering

摘　　要：采用真空电弧熔炼、单相区热锻以及冷轧等技术制备亚稳β型Ti-34Nb-4Zr-0.3O(质量分数/%)合金(TNZO),通过对冷轧态TNZO合金进行250℃和300℃的低温时效处理,揭示时效温度和时间对ω相析出行为与合金力学性能的影响规律。结果表明:低温时效使ω相呈纳米尺寸析出,导致合金的强度和弹性模量提高。300℃时效时,ω相易发生粗化和团聚,使合金的伸长率快速下降和脆化。250℃短时时效可使少量ω相弥散析出,使合金具备高强度、低模量、超高弹性和良好塑性的优异综合性能,在航空航天弹性钛合金和医用植入钛合金领域显示了广阔的应用前景。Metastableβtype Ti-34Nb-4Zr-0.3O(mass fraction/%)alloy(TNZO)was prepared by vacuum arc melting,single-phase hot forging and cold rolling.The cold-rolled TNZO alloys were aged at low-temperature of 250℃and 300℃in order to reveal the effect of aging temperature and time on the precipitation behavior ofωphase and the mechanical properties of the alloys.The results show thatωphase precipitates in nanometer size as a result of low temperature aging which leads to the increase of strength and elastic modulus of the alloys.ωphase is easy to coarsen and agglomerate when the alloy is aged at 300℃,which results in the rapid drop of the elongation and embrittlement of the alloy.Short time aging at 250℃could make theωphase precipitated dispersedly with small volume fraction,enabling the alloy to have excellent comprehensive properties of high strength,low modulus,ultra-high elasticity and good plasticity and show a broad application prospect in the field of aerospace elastic titanium alloys and medical implant titanium alloys.

关 键 词：亚稳Β钛合金 时效 Ω相 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]