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首页> 外文期刊>Journal of Crystal Growth >Direct observation of phase transformation layers in the undercooled hypoperitectic Ti_(47)Al_(53) alloy
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Direct observation of phase transformation layers in the undercooled hypoperitectic Ti_(47)Al_(53) alloy

机译：直接观察过冷的亚包晶Ti_（47）Al_（53）合金中的相变层

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The hypoperitectic Ti_(47)Al_(53) alloy was cyclically superheated in a containerless electromagnetic levitation apparatus in order to reach the state of supercooling. The maximum undercooling of the alloy melt was up to 250 K. Critical undercooling ranges for the formation of various competing phases were determined by transmission electron microscopy. The primary phase β in 0 K < ΔT < 36 K, the primary phase α in 36 K < ΔT < 120 K, and the primary phase γ in 120 K < ΔT < 250 K were determined by microstructure analysis. The transient nucleation theory was adopted to explain the phase evolution relationship in the undercooled melt on the consideration of the competing phase with the shortest incubation time having separated from the undercooled melt. Due to different structures of primary and secondary phases, clear fault ribbons from β to α (or α to γ) were detected on the boundary layer between primary and secondary phases. The reason for the formation of fault layers on the boundary layer was given with a view of the crystalline structure evolution.
机译：为了达到过冷状态，在无容器的电磁悬浮装置中使过包晶的Ti_（47）Al_（53）合金循环过热。合金熔体的最大过冷度高达250K。通过透射电子显微镜确定了形成各种竞争相的临界过冷范围。通过显微组织分析确定0 K <ΔT<36 K的初生相β，36 K <ΔT<120 K的初生相α和120 K <ΔT<250 K的初生相γ。考虑到竞争相，并用最短的孵育时间与过冷熔体分离，采用瞬态成核理论解释过冷熔体的相演化关系。由于初级和次级相的结构不同，在初级和次级相之间的边界层上检测到从β到α（或从α到γ）的清晰断裂带。考虑到晶体结构的演化，给出了在边界层上形成断层的原因。

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