(1. 云南大學(xué) 先進(jìn)材料工程技術(shù)研究中心，昆明 650091；
2. 昆明理工大學(xué) 材料與冶金工程學(xué)院，昆明 650093；
3. 昆明貴金屬研究所，昆明 650106)
摘 要: 采用超音速電弧噴射霧化(UAS)制備Ag-10Cu、Ag-28Cu、Cu-10Ag、Ag-10Ni和Ag-5Fe快速凝固合金粉末，用XRD對銀合金粉末的亞穩(wěn)固溶擴(kuò)展進(jìn)行研究。結(jié)果表明：Ag-10Cu、Ag-28Cu和Cu-10Ag合金粉末的平均亞穩(wěn)固溶度分別為7.09%、20.11%和3.06%(摩爾分?jǐn)?shù))；當(dāng)粉末粒度不大于50 mm時(shí)，Ag-28Cu共晶合金粉末形成完全亞穩(wěn)固溶體，而Ag-10Cu和Cu-10Ag未形成完全固溶體；Ag-10Ni和Ag-5Fe粉末(65~15 mm)的亞穩(wěn)固溶度分別為0.72%~1.30%Ni和0.29%~0.57%Fe，亞穩(wěn)固溶度隨粉末粒度減小而增加。合金生成熱和冷卻速率分別是判斷亞穩(wěn)固溶擴(kuò)展能力的熱力學(xué)參數(shù)和動(dòng)力學(xué)參數(shù)，合金生成熱越小、冷卻速率越高, 亞穩(wěn)固溶度就越大。超音速電弧噴射霧化有利于降低合金生成熱和獲得很高的冷卻速率，因此，銀合金粉末獲得大的亞穩(wěn)固溶擴(kuò)展。
關(guān)鍵字: Ag合金；超音速電弧噴射霧化；亞穩(wěn)固溶擴(kuò)展
ultrasonic arc spray
（1. Search Centre of Advanced Material Engineering, Yunnan University, Kunming 650091, China;
2. Faculty of Materials and Metallurgy Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
3. Kunming Institute of Precious Metals, Kunming 650106, China）
Abstract:Ag-10Cu, Ag-28Cu, Cu-10Ag, Ag-10Ni and Ag-5Fe alloy powders were prepared by ultrasonic arc spray. The metastable solution expansion of Ag alloy powders was studied by XRD. The results show that the average metastable solution of Ag-10Cu, Ag-28Cu and Cu-10Ag powders are 7.09%, 20.11% and 3.06%, respectively. The Ag-28Cu eutectic powders are single phase metastable fcc solid solution, while the powder size is not larger than 50 mm, but single phase metastable fcc solid solution cannot form in Ag-10Cu or Cu-10Ag powders. The metastable solution of Ag-10Ni and Ag-5Fe powders (65−15 mm) are 0.72%−1.30% Ni and 0.29%−0.57% Fe, respectively, and the metastable solution increases with decreasing powder size. The forming heat and the cooling rate are thermodynamics parameter and dynamics parameter for estimating the metastable solution expansion extent of alloy powders. The larger the extent of metastable solution expansion, the smaller the forming heat of alloy and the larger the cooling rate.
Key words: Ag alloy; ultrasonic arc spray; metastable solution expansion
