热处理工艺对Nb-Ti-Al基低密度铌合金力学性能及组织形貌的影响  

Study on the Influence of Heat Treatment Process on the Mechanical Properties and Microstructure of Nb-Ti-Al-Based Low Density Niobium Alloys

作　　者：李福成 LI Fucheng(National Engineering Research Center of Antalum and Niobium Materials,Shizuishan Ningxia 753000,China;Northwest Rare Metal Materials Research Institute,State Key Laboratory of Rare Metal Special Materials,Shizuishan Ningxia 753000,China;CNMC Ningxia Orient Group Co.LTD.,Ningxia Orient Tantalum Industry Co.LTD.,Shizuishan Ningxia 753000,China)

机构地区：[1]国家钽铌特种金属材料工程技术研究中心,宁夏石嘴山753000 [2]西北稀有金属材料研究院稀有金属特种材料国家重点实验室,宁夏石嘴山753000 [3]中色(宁夏)东方集团有限公司宁夏东方钽业股份有限公司,宁夏石嘴山753000

出　　处：《湖南工业大学学报》2024年第3期102-106,共5页Journal of Hunan University of Technology

基　　金：稀有金属特种材料国家重点实验室研发平台建设基金资助项目(2019BDC05001)。

摘　　要：将Nb-Ti-Al基低密度铌合金在不同的高温条件下进行热加工处理,并对合金涂层后的试样在1300℃高温熔烧30 min,利用INSTRON4505型万能试验机、金相显微镜、扫描电镜和能谱分析仪对热处理后试样的室温(25℃)力学性能(抗拉强度бb、屈服强度б0.2和延伸率)、金相组织、断口形貌等进行了对比分析。结果表明,当熔烧温度(t≥900℃)每升高100℃,抗拉强度下降9.23%,屈服强度下降9.11%,延伸率下降9.59%,晶粒度增大比例为21.43%,在熔烧温度高于1200℃时试样仅测出抗拉强度值就断裂了,表现出铌合金试样随着熔烧温度梯度的升高,样品基材的力学性能下降,晶粒度和硬度不断增大,塑性和韧性不断下降的规律。With Nb-Ti-Al-based low-density niobium alloy subjected to heat treatment under different high temperature conditions,the samples coated with the alloy are melted at a high temperature of 1300℃for 30 minutes.By using INSTRON4505 universal testing machines,metallographic microscopes,scanning electron microscopes,and energy spectrum analyzers,a comparative analysis has been made of the mechanical properties(with a tensil strength of/бb,a yield strength of/б0.2 and elongation),metallographic structure,and fracture morphology of the heat-treated sample at room temperature(25℃).The results show that for every 100℃increase in the melting temperature(t≥900℃),the tensile strength decreases by 9.23%,the yield strength decreases by 9.11%,the elongation decreases by 9.59%,while the proportion of grain size increases by 21.43%.With the melting temperature reaching higher than 1200℃,the sample experiences a fracture by only measuring the tensile strength value,showing that with an increase of the melting temperature gradient,the mechanical properties of the sample substrate decrease correspondingly,the grain size and hardness increase continuously,while the plasticity and toughness decrease continuously as well.

关 键 词：Nb-Ti-Al基低密度铌合金 热处理工艺 力学性能 金相组织 断口形貌 

分 类 号：TG113.25[金属学及工艺—物理冶金] TG115.21[金属学及工艺—金属学]