Si元素对Ti-6Al-2Zr-1Mo-1V钛合金力学性能的影响（英文）  

Effect of Silicon on Mechanical Properties of Ti-6Al-2Zr-1Mo-1V Alloy

作　　者：巨建涛[1] 王悦[1] 郝芳[2] 杜予晅[2] 蒋伟 孙峰[2] Ju Jiantao;Wang Yue;Hao Fang;Du Yuxuan;Jiang Wei;Sun Feng(Xi’an University of Architecture and Technology, Research Center of Metallurgical Engineering and Technology of Shaanxi, Xi’an 710055,China;Western Superconducting Technologies Co., Ltd, Xi’an 710018,China)

机构地区：[1]西安建筑科技大学陕西省冶金技术研究中心,陕西西安710055 [2]西部超导材料科技股份有限公司,陕西西安710018

出　　处：《稀有金属材料与工程》2019年第6期1749-1755,共7页Rare Metal Materials and Engineering

摘　　要：研究了Si元素含量对Ti-6Al-2Zr-1Mo-1V钛合金在室温和500℃下力学性能的影响。采用扫描电镜(SEM)和透射电镜(TEM)对断口形貌和微观结构进行了分析,硅化物的形核和生长与力学性能关系密切。结果表明:在Ti-6Al-2Zr-1Mo-1V合金中加入0.04%~0.14%(质量分数,下同)的Si可以提高合金的抗拉强度和高温持久性能,塑性变化较小,冲击韧性和平面应变断裂韧度显著降低。Si的加入使合金呈现由韧性向脆性断裂转变的趋势,放射区增大,纤维区和剪切唇区减小。当Si含量小于0.09%时,Si元素完全溶解于α和β相中,以固溶强化机制为主。当Si元素含量达到0.14%时,相界处析出硅化物,强化机制为固溶强化和析出强化的结合。The influence of Si content on the mechanical properties of Ti-6Al-2Zr-1Mo-1V titanium alloy at room temperature and 500 °C was studied. The fracture morphologies and microstructures were analyzed by scanning electron microscope(SEM) and transmission electronic microscope(TEM). The nucleation and growth of silicide were related to the mechanical properties. The results show that the tensile strength and high-temperature strengthening performance are improved when 0.04 wt%~0.14 wt% Si is added to the Ti-6 Al-2 Zr-1 Mo-1 V alloy;the plasticity is less changed;the impact toughness and plane strain fracture toughness are decreased. An alternating tendency from ductile fracture to brittle fracture can be found with the addition of Si, the radial region is enlarged, and the area of fibrous region and shear lip is minified. When the content of Si is less than 0.09 wt%, the Si elements are dissolved in α and β phase, and solid solution strengthening mechanism dominates. The silicide precipitates along the phase boundary when the content of Si reaches 0.14 wt%, which leads to a combination of solution strengthening and precipitation strengthening.

关 键 词：TA15钛合金 力学性能 断口形貌 硅化物析出 固溶强化 析出强化 

分 类 号：TG146.23[一般工业技术—材料科学与工程]