α相含量对新型亚稳β钛合金动态力学性能的影响  

Dynamic Mechanical Properties of New Type of Metastable Titanium Alloy with DifferentαPhase Content

作　　者：尤中源 刘文言 陈荣 谭成文[2] 徐大斌 You Zhongyuan;Liu Wenyan;Chen Rong;Tan Chengwen;Xu Dabin(School of Mechanical Electronic and Information Engineering,China University of Mining and Technology,Beijing 100083,China;School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中国矿业大学(北京)机电与信息工程学院,北京100083 [2]北京理工大学材料学院,北京100081

出　　处：《稀有金属》2021年第7期891-896,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51001014)资助。

摘　　要：通过对2A2F(Ti-2Al-9.2Mo-2Fe-0.1B)钛合金在相变点以下进行固溶处理,使用扫描电镜和电子背散射衍射对处理后的显微组织与其在高应变率条件下的动态力学性能的关系进行了研究。结果表明,在650~790℃范围内,随着固溶温度的升高,实验合金组织中初生α相减少,动态流动应力降低,均匀塑性应变升高。经650℃固溶处理后,初生α相形状为针状,随着温度的升高,760℃和790℃固溶处理的初生α相为短棒状。同时,随着初生α相含量减少,β相中β相稳定元素含量降低。790℃固溶试样经加载后出现了{332}<113>机械孪晶,使其塑性得到极大的提升。Titanium alloy has excellent specific strength and corrosion resistance,so it has a wide range of applications in weapons and aviation industry.The metastableβtitanium alloy has the highest specific strength because the second phase precipitation can be strengthened by heat treatment.In the field of armor,materials will be affected by high-speed impact,so the study of mechanical behavior of materials under high strain rate is indispensable.When applied in the field of armor,materials will be affected by high-speed impact.The strain rate of materials is very high,and its mechanical behavior is different from usual.Therefore,it is indispensable to study the mechanical behavior of materials under high strain rate.For titanium alloy,the morphology and content ofαphase have a great influence on its mechanical properties.In recent years,many scholars have studied the effect ofαphase on the mechanical properties of titanium alloys.In metastableβ-Ti alloy,the content ofαphase not only affects the strengthening effect of the second phase,but also changes the content ofβ-phase stable elements in the matrixβ-phase,which changes the deformation mechanism of the alloy.The effect ofαphase on the relative mechanical properties ofα+βtitanium alloys such as TC4 has been studied in detail,but less research has been done on metastableβtitanium alloys.Therefore,in this paper,the effect ofαphase on the dynamic mechanical properties of metastableβtitanium alloys was studied by adjusting the morphology and content ofαphase in titanium alloys by heat treatment.The experimental alloy was a high strength and low cost metastableβ-titanium alloy 2A2F(Ti-2 Al-9.2 Mo-2 Fe-0.1 B)jointly developed by Korea Institute of Materials Science and Beijing General Research Institute for Nonferrous Metals.After heat treatment,a cylindrical sample ofФ4 mm×4 mm was selected along the axial direction of the rod by wire cutting with electric spark.The samples were tested with separated Hopkinson pressure bars,and the obtained strain-time an

关 键 词：亚稳Β钛合金 显微组织 动态力学性能 机械孪晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]