(1. 西安交通大學(xué) 金屬材料強(qiáng)度國(guó)家重點(diǎn)實(shí)驗(yàn)室， 西安 710049;
2. 西安交通大學(xué) 建筑工程與力學(xué)學(xué)院， 西安 710049)
摘 要: 應(yīng)用掃描電子顯微鏡原位拉伸方法研究了純鋁/硬鋁爆炸焊接界面微觀斷裂機(jī)制。結(jié)果表明： 在單向拉伸情況下， 在夾雜和應(yīng)力集中等薄弱位置萌生的界面微裂紋為典型擴(kuò)展金屬/金屬界面裂紋機(jī)制； 微裂紋以脆性方式導(dǎo)致界面分離，或以其裂尖區(qū)域位錯(cuò)發(fā)射的延性方式長(zhǎng)大； 主裂紋和微裂紋以通過(guò)在界面一側(cè)金屬中其間韌帶斷裂方式連接， 最后失穩(wěn)擴(kuò)展。 在擴(kuò)展路徑上， 界面和金屬交替出現(xiàn)， 且界面的斷裂韌性不如相應(yīng)單一材料的斷裂韌性。
關(guān)鍵字: 爆炸層合板； 界面裂紋； 裂紋擴(kuò)展； 原位拉伸
ZHANG Jing1, ZHU Yan1, SUN Jun1
（ 1. State Key Laboratory for Mechanical Behavior of Materials,
Xi'an Jiaotong University, Xi'an 710049, China;
2. School of Civil Engineering and Mechanics,
Xi'an Jiaotong University, Xi'an 710049, China）
Abstract: The micro-fracture mechanism of explosive clad Al/LY12 interface were studied by scanning electronic microscopy (SEM) with in-situ tensile. The results indicate that, under uni-axial tensile, the microcracks mechanism of interface at the weak site of voids and debonding is interface cracks of metal/metal, and as well as the micro-cracks grow by means of brittle mode to debond interface or dislocation emission, blunting and sharpening. And each other of main cracks and microcracks coalesces through ductile or brittle fracture of the metal ligament. On the fractured interface, both the surfaces of the interface and metal exist alternately along the crack growth path. The fracture toughness of the bimetallic interfaces is lower than those of respective counterpart metals.
Key words: explosive clad metal; interfacial crack; crack growth； in-situ tensile
