(1. 云南大學 先進材料工程研究中心，昆明 650091；
2. 云南省新材料制備與加工重點實驗室，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制備Ag-10Ni、Ag-5Fe合金粉末，采用SEM對合金粉末的快速凝固組織特征進行研究。結合相圖和X射線能譜(EDS)對快速凝固組織形成機制進行分析。結果表明：Ag-10Ni、Ag-5Fe粉末的快速凝固組織特征為α(Ag)+β(Ni)+Ni、α(Ag)+β(Fe)+Fe，α(Ag)、β(Ni)、β(Fe)為亞穩(wěn)擴展固溶體；α(Ag)為樹枝晶組織，二次枝晶間距約0.2 mm；β(Ni)、β(Fe)是彌散分布在α(Ag)中的微納米球形粒子；直徑較大的β(Ni)、β(Fe)中互彌散分布著納米α(Ag)和Ag。
關鍵字: Ag-Ni；Ag-Fe；超音速電弧噴射霧化；快速凝固組織
Ag-Ni and Ag-Fe powders by ultrasonic arc spray
（1. Research Centre of Advanced Material Engineering, Yunnan University, Kunming 650091, China;
2. Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650093, China;
3. Kunming Institute of Precious Metals, Kunming, 650106, China）
Abstract: Ag-10Ni and Ag-5Fe alloy powders were prepared by ultrasonic arc spray atomization process. The microstructure of the rapidly solidified alloy powders was investigated by SEM. The mechanism of the microstructure formation in RS powders was discussed according to phase diagram with EDS. The results show that the rapid solidification textures of Ag-10Ni and Ag-5Fe powders are α(Ag)+β(Ni)+Ni and α(Ag)+β(Fe)+Fe, respectively. α(Ag), β(Ni) and β(Fe) are metastable expansion solutions. α(Ag) is dendritic structure. β(Ni) and β(Fe) are tiny ball particles dispersed in α(Ag) matrix, and β(Ni) and β(Fe) particles with larger diameter contain dispersed α(Ag) particles.
Key words: Ag-Ni; Ag-Fe; ultrasonic arc spray atomization; rapid solidification texture
