水下搅拌摩擦加工Ti-15-3合金的组织及超塑性变形  

Microstructure and superplastic deformation of Ti⁃15⁃3 alloy by underwater friction stir processing

作　　者：倪立锦 王文[1] 韩鹏 乔柯[1] 强凤鸣 王快社[1] NI Lijin;WANG Wen;HAN Peng;QIAO Ke;QIANG Fengming;WANG Kuaishe(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《兵器材料科学与工程》2024年第4期59-63,共5页Ordnance Material Science and Engineering

基　　金：军委科技委173计划重点基金(2021-JCJQ-JJ-0190)。

摘　　要：采用水下搅拌摩擦加工技术制备细晶Ti-15V-3Al-3Cr-3Sn(Ti-15-3)合金。通过电子背散射衍射对搅拌区(stirring zone,SZ)晶粒细化机制进行分析。用电子万能试验机对SZ试样进行超塑性拉伸。结果表明:SZ高角度晶界比例为74.5%,平均晶粒尺寸为1.8μm,主要的晶粒细化机制为连续动态再结晶;在变形温度为675℃,应变率为3×10^(-4)s^(-1)时,SZ试样的伸长率达到了465%,为超塑性,主要变形机制为晶界滑移,同时伴随连续动态再结晶和β→α相变。The fine crystal Ti⁃15V⁃3Al⁃3Cr⁃3Sn(Ti⁃15⁃3)alloy was prepared by friction stir process under water.The grain refinement mechanism of Stirring zone(SZ)was analyzed by electron backscattering diffraction.The SZ sample was superplastic stretched by electronic universal testing machine.The results show that the proportion of high angle grain boundaries of SZ is 74.5%,the average grain size is 1.8μm,and the main grain refinement mechanism is continuous dynamic recrystallization.When the deformation temperature is 675℃and the strain rate is 3×10^(-4) s^(-1),the elongation of SZ sample reaches 465%superplasticity.The main deformation mechanism is grain boundary sliding accompanied by continuous dynamic recrystallization andβ→αtransformation.

关 键 词：水下搅拌摩擦加工 TI-15-3合金 显微组织 超塑性 晶界滑移 

分 类 号：TB31[一般工业技术—材料科学与工程]