摘要
通过激光熔化沉积工艺制备出Ti60合金和TiCP(质量分数为5%)/Ti60复合材料薄壁材料,分析了两种材料的显微组织及600℃下的高温拉伸性能。结果表明,激光熔化沉积Ti60合金具有典型的魏氏组织特征,在亚晶界处和α/β界面处存在球形富钕稀土相;TiCP/Ti60复合材料中存在少量未完全熔化的TiC颗粒,熔化析出的TiC相呈断续链状,均匀分布于基体中,TiC与钛合金基体的界面结合良好。在600℃下,TiCP/Ti60复合材料的拉伸强度比Ti60合金提高了65 MPa,而延伸率明显降低。Ti60合金在高温下发生韧性断裂,而TiCP/Ti60复合材料的断口特征比较复杂,既有沿晶断裂和准解理断裂也有局部的韧性断裂。
Wall-like Ti60 alloy and TiCP（mass fraction 5%）/Ti60 titanium matrix composites are fabricated by laser direct deposition process.Their microstructure and tensile properties under 600 ℃ are investigated.The results indicate that the deposited Ti60 alloy presents a widmanstatten structure with some spherical rare earth phases distributing along the sub-grain boundaries and the α/β interface.For the deposited TiCP/Ti60 composites,there are some un-melted TiC particles and re-solidified TiC particles appear as discontinuous chain-like.The TiC particles distribute uniformly within the matrix with good interface bonding.Under 600 ℃,the ultimate tensile strength（UTS） of TiCP/Ti60 composites is 65 MPa higher than that of Ti60 alloy,following with decreased elongation.Ti60 alloy exhibit ductile fracture characteristics,while TiCP/Ti60 composite exhibit some complicated fracture characteristics including intergranular fracture,quasi-cleavage crack and local ductile rupture.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第3期103-108,共6页
Chinese Journal of Lasers
基金
国家973计划基金(2011CB606305)
国家自然科学基金(50871023)资助课题
作者简介
孙景超（1985-），男，硕士研究生，主要从事激光熔化沉积钛基复合材料方面的研究。E—mail：sunjingchao5@gmail．com
导师简介：张永忠（1970-），男，博士，教授级高工，主要从事高性能金属零件及梯度复合材料的激光熔化沉积成形等方面的研究。E—mail：yyzhang@grinm．com
