铸态Ti-6Al-xMo合金的微观组织和力学性能
Microstructure and mechanical properties of as-cast Ti-6Al-xMo alloys
郭依航 1景然 2刘以柔 1吴倩 1刘禹驰 1李江华 2炊鹏飞2
作者信息
- 1. 陕西理工大学材料科学与工程学院,陕西汉中 723000
- 2. 陕西理工大学材料科学与工程学院,陕西汉中 723000;陕西理工大学矿渣综合利用环保技术国家地方联合工程实验室,陕西汉中 723000
- 折叠
摘要
通过非自耗真空电弧熔炼炉制备了铸态Ti-6Al-xMo(x=0、4、8、12、16和20 mass％)合金,采用X射线衍射仪(XRD)、光学显微镜(OM)、扫描电镜(SEM)、硬度测试和压缩实验等研究了不同Mo元素含量的Ti-6Al-xMo合金的微观组织和力学性能.结果表明:随着Mo元素含量的增加,合金发生了α→α'+β→α″+β→β的相变过程.Ti-6Al合金显微组织由分布不均匀的片状α相组成.当Mo元素含量为4 mass％时,合金中出现明显的β晶界和细针状的α'马氏体相;当Mo元素含量增加至12 mass％时,合金中出现细针状的α″马氏体相和不连续的亚晶界;当Mo元素含量增加至16 mass％以上时,合金组织由粗大等轴β晶粒组成.铸态Ti-6Al合金的应力-应变曲线呈现"PLC效应";Ti-6Al-16Mo和Ti-6Al-20Mo合金的压缩塑性超过50％仍未断裂,表现出良好的塑性;断口形貌表明添加Mo元素后所有合金均为韧性断裂.
Abstract
As-cast Ti-6Al-xMo(x=0,4,8,12,16 and 20 mass％)alloys were prepared by non-consumable vacuum arc melting furnace.Microstructure and mechanical properties of the Ti-6Al-xMo alloys with different Mo contents were studied by means of X-ray diffraction(XRD),optical microscope(OM),scanning electron microscopy(SEM),hardness test and compressive test.The results show that with the increase of Mo element content,the phase structure of the alloys changes from α → α'+β → α"+β → β.The microstructure of the Ti-6Al alloy consists of unevenly distributed lamellar α phase.When the content of Mo element is 4 mass％,obviousβ grain boundaries and acicular α'martensite phase appear in the alloy.When the content of Mo element increases to 12 mass％,acicularα"martensite phase and discontinuous sub-grain boundaries appear in the alloy.When the content of Mo element increases to more than 16 mass％,the microstructure of the alloy is composed of coarse equiaxed β grains.The stress-strain curve of the as-cast Ti-6Al alloy shows"PLC effect".The compressive plasticity of the Ti-6Al-16Mo and Ti-6Al-20Mo alloys exceeds 50％but still does not fracture,showing good plasticity.The fracture morphology shows that all alloys exhibit ductile fracture after the addition of Mo element.
关键词
Ti-6Al-xMo合金/相结构/显微组织/力学性能Key words
Ti-6Al-xMo alloy/phase structure/microstructure/mechanical property引用本文复制引用
基金项目
国家自然科学基金(51701111)
国家自然科学基金(51901120)
陕西省自然科学基础研究计划项目(2024JC-YBMS-355)
陕西省自然科学基础研究计划项目(2024JC-YBMS-292)
出版年
2024
NETL
NSTL
万方数据