(1. 沈陽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，沈陽 110870；
2. 遼寧石化職業(yè)技術(shù)學(xué)院 石油化工系，錦州 121001)
摘 要: 采用銅模鑄造法制備直徑為3 mm的Mg81Ni8Zn5Y6非晶復(fù)合材料，并分別在473和773 K條件下對材料等溫?zé)崽幚? h。采用掃描電鏡(SEM)、高分辨透射電子顯微鏡(HRTEM)、X射線衍射儀(XRD)等方法分別對鑄態(tài)、熱處理態(tài)復(fù)合材料的組織、相組成和結(jié)構(gòu)進(jìn)行分析，研究長周期(LPSO)相的熱穩(wěn)定性及不同長周期(LPSO)結(jié)構(gòu)間的轉(zhuǎn)化過程。結(jié)果表明:鑄態(tài)Mg81Ni8Zn5Y6非晶復(fù)合材料的LPSO相為14H結(jié)構(gòu)；473 K熱處理5 h后，LPSO相轉(zhuǎn)化為18R結(jié)構(gòu)；773 K熱處理5 h后，LPSO相轉(zhuǎn)化為穩(wěn)定的6H結(jié)構(gòu)；成分和熱處理溫度均對長周期轉(zhuǎn)化類型有影響。
關(guān)鍵字: MgNiZnY合金；非晶復(fù)合材料；熱處理；長周期結(jié)構(gòu)；熱穩(wěn)定性
（1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. Petrol-Chemical Department, Liaoning Petrol-Chemical Vocational and
Techonology College, Jinzhou 121001, China）
Abstract:Mg81Ni8Zn5Y6 amorphous matrix composites with 3 mm in diameter were fabricated by conventional Cu-mold casting method and the resultant samples were heat-treated at 473 and 773 K for 5 h, respectively. The microstructure, phase constituent and structure of the as-cast and the annealed samples were analyzed by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and X-ray diffractometry (XRD). The thermal stability and the transformation process of different long-period stacking ordered (LPSO) structure were investigated. The results show that the LPSO structure in the as-cast sample, the (473 K, 5 h)-annealed sample and the (773 K, 5 h)- annealed sample are 14H, 18R and 6H, respectively. Furthermore, the LPSO structure formation is influenced by both the composition of the alloy and the temperature of heat treatment employed.
Key words: MgNiZnY alloy; amorphous matrix composites; heat treatment; long-period stacking ordered structure; thermal stability
