(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 湘潭大學(xué) 材料設(shè)計(jì)及制備技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室，湘潭 411105)
摘 要: 研究固態(tài)Zn/Fe 及Zn/Fe-Si擴(kuò)散偶中金屬間化合物的生長(zhǎng)及硅的影響。對(duì)擴(kuò)散偶在385 ℃下擴(kuò)散30~ 300 min的研究結(jié)果表明：在Zn/Fe擴(kuò)散偶中，擴(kuò)散層以δ相為主，ζ相和δ相之間具有平直的界面，隨擴(kuò)散時(shí)間的延長(zhǎng)，δ相的厚度增加，ζ相逐漸被消耗，至退火300 min時(shí)，dζ/dδ的值為0；但在Zn/Fe-Si擴(kuò)散偶中，擴(kuò)散層以ζ相為主，δ相呈小島狀伸入到ζ相層中，鐵基體中的硅促進(jìn)擴(kuò)散初期ζ相的生長(zhǎng)而抑制δ相的生長(zhǎng)，并使δ層在擴(kuò)散后期為完全的線性生長(zhǎng)。3個(gè)擴(kuò)散偶中總擴(kuò)散層的生長(zhǎng)均由擴(kuò)散控制。
關(guān)鍵字: Zn-Fe金屬間化合物；擴(kuò)散偶；顯微組織；生長(zhǎng)動(dòng)力學(xué)
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China）
Abstract:The growth of Zn-Fe intermetallic compounds and the effect of Si were studied by means of diffusion experiments at 385 ℃ for 30−300 min. The results show that the diffusion layers is mainly composed of δ phase in Zn/Fe couples, the interface between ζ and δ phases is planar, the thickness of δ phase increases and ζ phase decreases with time, dζ/dδ is zero at 300 min. In Zn/Fe-Si couple, the diffusion layers is mainly composed of ζ phase, δ phase protrudes into ζ phase in island shape, and the silicon in iron promotes the growth of ζ phase and restrains the growth of δ phase in the initial period, δ phase increases linearly with the increase of time in the later period. The growth of the total layer in three couples is diffusion-controlled.
Key words: Zn-Fe intermetallic compounds; diffusion couple; microstructure; growth kinetics
