2/Mo涂層加熱至1000 ℃，再迅速冷卻至室溫進(jìn)行熱震循環(huán)，表征了材料在熱震循環(huán)過(guò)程中裂紋的演變過(guò)程并評(píng)估了MoSi2/Mo涂層的熱沖擊行為。采用Abaqus軟件計(jì)算了MoSi2/Mo涂層在熱沖擊過(guò)程中的應(yīng)力分布，討論了熱震循環(huán)中裂紋的發(fā)展過(guò)程。結(jié)果表明：Mo基體與MoSi2涂層之間存在較高的熱沖擊應(yīng)力，這將導(dǎo)致裂紋的萌生和擴(kuò)展。計(jì)算結(jié)果顯示：在最初的10次熱震循環(huán)中，涂層產(chǎn)生了垂直于界面的裂紋，在界面上沒(méi)有出現(xiàn)裂紋，涂層與基體仍結(jié)合良好；在隨后的熱震循環(huán)中開(kāi)始出現(xiàn)界面裂紋，界面裂紋開(kāi)始于垂直裂紋的末端區(qū)域，當(dāng)垂直裂紋與界面裂紋匯聚，會(huì)導(dǎo)致涂層剝離和涂層失效。;The thermal shock behavior of molybdenum disilicide (MoSi2)/molybdenum (Mo) coating and the crack propagation were evaluated by heating the coating to 1000 °C, and then cooling it down to room temperature under the protection atmosphere of hydrogen during the thermal shock cycle. Meanwhile the thermal stress distribution of MoSi2/Mo coating during thermal shock was calculated by Abaqus software. The development process of crack during thermal shock cycles was discussed. The results show that there is a high thermal shock stress between the Mo substrate and MoSi2 coating, which can lead to the crack initiation and propagation. According to the extended finite element simulation results, the cracks appear perpendicular to the interface during the first ten thermal shock cycles, while the coating is still well bonded with the substrate and shows no signs of crack along the interface. The interfacial crack appears in the subsequent thermal shock cycles. The interfacial crack begins at the end zone of the vertical crack. When the vertical crack and the interfacial crack converge, the coating peels off and the coating failure occurs."/>
2涂層;熱沖擊;有限元模擬;應(yīng)力分布;MoSi2 coating;thermal shock;finite element simulation;stress distribution"/>