摘要
借助ＳＥＭ及ＥＤＡＸ、ＡＥＳ对某些ＴＣ１１钛合金棒材机械性能差的原因进行了研究。。结果表明材料延伸率、断面收缩率及冲击值低，显微硬度值高的拉伸和冲击断口上都呈现脆性解理断裂的断裂源，源区显微组织为条状α及空洞，且氧铝偏高。氧铝偏高造成α＋β→β相变温度和再结晶温度升高，使加工变形中形成的条状α在随后的热处理中得不到改变，并导致拉伸。
The tensile fracture structures, the metallographic microstructure and the aly composition near by the fractures of TC11 alloy were analyzed by SEM, EDAX and AES. The results indicate that there is a brittle fracture origin of cleavage fracture in the fracture samples with lower tensile elongation, lower area reduction and impact value and higher microscopic hardness. The structure of origin region consists of the platelet #FKα#FS phase and some holes, which is different from the equiaxed α+β structrue in the normal region. The oxygen and aluminum contents in the origin region are much more than that in the normal region. The higher O and Al contents may elevate the α+β→β trans temperature of the origin region and impede to change the morphology of the platelet α structure formed during deformation in the followed treatment, which result in the brittle fracture of the alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
1996年第4期25-29,共5页
Rare Metal Materials and Engineering
关键词
钛合金
脆性
断裂
氧铝偏析
TC11 titanium alloy,brittle fracture,segregation of oxygen and xluminum
