摘要
研究了ＦｅＭｏＳｉＢ纳米晶合金薄带的脆性断裂行为．利用激光打孔形成预裂纹，并结合断裂表面的微观形貌观察，从能量的观点解释了裂纹扩展过程中的分又现象，对材料ｒ断裂韧性进行了定性和定量分析，指出常数 σ_ｃ（πａ_ｓ）１／２并不是断裂韧性Ｋｃ．
By employing a pulsed laser source to produce microcracks, typical features of brit tle fracture of nanocrystalline FeMoSiB ribbon have been investigated by SEM. From the energetic viewpoint, explanation to the branching behaviors of a moving crack front was proposed, and fracture toughness of the material was calculated. It was shown that the constant σ_ｃ(πa_ｓ)~1/2 was different from fracture toughness K_c.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第4期356-358,共3页
Acta Metallurgica Sinica
基金
国家自然科学基金!59931020
国家自然科学基金!59801012
关键词
纳米晶合金
脆性断裂
裂纹分叉
断裂韧性
nanocrystalline, brittle fracture, branching, fracture toughness
