(西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710072)
摘 要: 對(duì)CMSX-2合金粗枝晶、細(xì)枝晶以及超細(xì)枝晶單晶持久變形后的位錯(cuò)組態(tài)進(jìn)行了研究。結(jié)果表明：超細(xì)枝晶單晶持久變形過(guò)程中在γ/γ′相界上形成的位錯(cuò)網(wǎng)絡(luò)比粗枝晶單晶的均勻；γ相內(nèi)部形成的位錯(cuò)密度減小，分布也更加均勻，多位錯(cuò)滑移程度降低；切過(guò)γ′的位錯(cuò)明顯減少，反映出高溫下合金抵抗蠕變變形的能力提高。
關(guān)鍵字: 高溫合金；定向凝固；持久性能；位錯(cuò)；凝固組織
structure and dislocation
configuration in CMSX-2 superalloy
LI Shuang-ming，DU Wei，LIU Lin，F(xiàn)U Heng-zhi
（State Key Laboratory of Solidification Processing，
Northwestern Polytechnical University， Xi′an 710072，China）
Abstract:The dislocation configuration in coarse dendrite and fine dendrite as well as superfine dendrite single crystals of CMSX-2 superalloy after rupture d e formation was investigated. The results show that the dislocation nets formed at γ′/γ phase interface are more integrated in superfine dendrite single crystals than those in coarse dendrite single crystals. In addition，the distribution o f dislocations in γ′ phase of superfine dendrite single crystals is more uniform and the number of dislocations cutting γ′ phase is fewer than that in coarse dendrite single crystals. This reveals that superfine super alloy has higher ability in resisting creep deformation than coarse dendrite super alloy does.
Key words: CMSX-2 superalloy； directional solidification; solidified structure; rupture properties; dislocation
