(南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室，南昌 330063)
摘 要: 采用SEM和XRD等手段，分析勵(lì)磁電流和凝固壓力對ZL205A合金中θ(Al2Cu)相的生長取向及形貌的影響，探討交變磁場-真空差壓協(xié)同場下ZL205A合金中θ(Al2Cu)相的生長特性。結(jié)果表明，交變磁場-真空差壓協(xié)同作用對ZL205A合金中θ(Al2Cu)相的生長取向以及形貌的影響顯著。隨著勵(lì)磁電流的增大，ZL205A合金的擇優(yōu)生長取向面(110)、(211)、(112)、(310)和(202)逐漸被抑制，當(dāng)勵(lì)磁電流增加至10 A時(shí)，(112)晶面已經(jīng)完全被抑制，同時(shí)ZL205A合金中θ(Al2Cu)相形貌出現(xiàn)了粗化現(xiàn)象；當(dāng)勵(lì)磁電流超過10 A增加至15 A時(shí)，θ(Al2Cu)相的擇優(yōu)生長取向只剩(110)和(211)兩個(gè)晶面，其他生長取向被完全抑制，而大部分θ(Al2Cu)相組織由連續(xù)的樹枝網(wǎng)絡(luò)狀轉(zhuǎn)變?yōu)榧?xì)小的碎片狀；隨著凝固壓力的增加，ZL205A合金中θ(Al2Cu)相的主要擇優(yōu)生長取向面(110)、(211)、(112)和(202)被逐漸抑制，θ(Al2Cu)相的細(xì)化效果越來越顯著；勵(lì)磁電流為15 A、凝固壓力為350 kPa時(shí)，交變磁場與凝固壓力協(xié)同作用效果最佳。
關(guān)鍵字: 交變磁場；凝固壓力；θ(Al2Cu)相；生長取向；形貌
（National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology Institute, Nanchang Aeronautical University, Nanchang 330063, China）
Abstract:The effects of excitation current and solidification pressure on the growth orientation and morphology of θ(Al2Cu) phase in ZL205A alloy were analyzed by means of SEM and XRD. The growth characteristics of θ(Al2Cu) phase in ZL205A alloy under alternating magnetic field-vacuum counter-pressure were investigated. The results show that the synergistic effect of alternating magnetic field-vacuum counter-pressure on the growth orientation and morphology of θ(Al2Cu) phase in ZL205A alloy is significant. With the increase of excitation current, the preferred growth orientation planes (110), (211), (112), (310) and (202) of ZL205A alloy are gradually suppressed. When the excitation current is increased to 10A, the (112) crystal plane is completely suppressed, and the θ(Al2Cu) phase morphology in ZL205A alloy is coarsened. When the excitation current exceeds 10 A and increases to 15 A, the preferred growth orientations of θ(Al2Cu) phase are only (110) and (211), and the other growth orientations are completely suppressed. And most of the θ(Al2Cu) phase structure changes from a continuous branch network to a fine fragment. With the increase of solidification pressure, the main growth preferred orientation planes (110), (211), (112) and (202) of θ(Al2Cu) phase in ZL205A alloy are gradually suppressed, and the refinement effect of θ(Al2Cu) phase is more remarkable. Meanwhile, the optimal synergistic effect is obtained when the excitation current is 15 A and solidification pressure is 350 kPa.
Key words: alternating magnetic field; solidification pressure; θ(Al2Cu) phase; growth orientation; morphology
