摘要
研究了通过热处理制度调整,在合金α片层之间形成细小的条状次生α相,形成一种新型的钛合金显微组织——双片层组织。通过对比等轴组织、双态组织、片层组织和双片层组织的性能,结果表明,在合金的强度和塑性不损失的条件下,双片层组织进一步提高了裂纹在合金中的扩展阻抗,使得合金的断裂韧性得到改善,疲劳裂纹扩展速率得到降低。双片层组织提高了疲劳裂纹扩展路径,使得大量的次生裂纹萌生。
A new type of microstructure, named bi-lamellar microstructure of titanium alloy comes out of precipitated small secondary α needles in the β matrix through modification heat treatment. A comparison of microstructure and property of titanium alloy between equaixed, bi-model and lamellar microstructure is made. The results manifest that bi-lamellar microstructure improves the fracture toughness and fatigue crack propagation behavior of TA15 alloys remarkably, increases the length of fatigue crack propagation and brings about large secondary cracks.
出处
《材料开发与应用》
CAS
2011年第6期17-21,共5页
Development and Application of Materials
关键词
显微组织
损伤容限
疲劳裂纹扩展速率
断裂韧性
Microstructure
Damage tolerance
Fatigue crack propagation rate
Fracture toughness
