B和Y复合添加对近α钛合金组织性能的影响  

Effect of Co-addition of B and Y on Microstructure and Mechanical Properties of Near α Titanium Alloy

作　　者：吴介[1] 郭冲霄 张长江[1] 张树志[1] 韩建超 林鹏[1] 陈玉勇[2] 王保成[1] Wu Jie;Guo Chongxiao;Zhang Changjiang;Zhang Shuzhi;Han Jianchao;Lin Peng;Chen Yuyong;Wang Baocheng(Taiyuan University of Technology,Taiyuan 030024,China;National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]太原理工大学,山西太原030024 [2]哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2018年第11期3487-3492,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51504163;51604191);北京科技大学新金属材料国家重点实验室基金(2014-ZD06)

摘　　要：研究了少量B和Y的添加对一种新型近α高温钛合金的显微组织和力学性能的影响。对含B和Y铸态合金的凝固路径和初生β晶粒和α板条的细化机理进行了分析和研究。结果表明:B和Y的添加对铸态合金的显微组织有显著影响,添加B和Y后,基体合金的显微组织明显细化。基体合金的力学性能发生了显著变化,极限压缩强度和屈服强度也随B和Y的添加而逐渐增大,这主要是由于B和Y的添加造成的晶粒细化。合金的压缩塑性和断裂韧性随B和Y的添加逐渐降低,主要是TiB在受到载荷时先断裂以及Y_2O_3从基体中拨出从而加速了裂纹的扩展造成的。The effects of the co-addition of a small amount of B and Y on the microstructure and mechanical properties of a novel near α high temperature titanium alloy were studied.The solidification paths and the refinement mechanism of the titanium alloys with different B and Y additions were studied.The results show that the addition of B and Y has a significant effect on the refinement of grain size of the titanium alloys.The ultimate compressive strength and yield strength increase with the addition of B and Y,which is mainly due to the grain refinement caused by the addition of B and Y.The compressive plasticity and fracture toughness of the alloys decrease gradually with the addition of B and Y,which is attributed to the fractured TiB together with Y2O3 pulled out the matrix,accelerating the propagation of the crack.

关 键 词：近Α钛合金 组织演变 凝固路径 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]