(中國科學(xué)院金屬研究所 金屬腐蝕與防護(hù)國家重點(diǎn)實(shí)驗(yàn)室， 沈陽 110015)
摘 要: 用X射線衍射方法研究了球磨驅(qū)動(dòng)制備Ag50Ni50 (摩爾比)合金粉末的機(jī)械合金化過程。研究結(jié)果表明， Ag50Ni50的混合粉末能形成有一定固溶度和納米級晶粒的α-Ag和β-Ni兩相混合粉末。球磨后的粉末在℃熱壓后，盡管兩相的顆粒都有所長大， 但仍然保持納米尺度。熱壓塊體化的Ag50Ni50合金密度很高，經(jīng)600 ℃，24h退火處理后，其α-Ag和β-Ni相顆粒均成倍長大。顯微組織結(jié)果表明合金中存在微米級網(wǎng)狀α-Ag相，并討論了其生成機(jī)制。
關(guān)鍵字: 機(jī)械合金化； 熱壓； 納米晶； 雙相合金； Ag50Ni50
（State Key Laboratory for Corrosion and Protection, Institute of Metals Research, The Chinese Academy of Sciences, Shenyang 110015, P.R.China）
Abstract:The Ag50Ni50 powder alloy was prepared by mechanical alloying (MA) process and the immiscible AgNi system with a positive heat of mixing was investigated by Xray diffraction (XRD). The results indicate that, ball milling of mixed elemental powders with nominal composition Ag50Ni50 results in the formation of mixtures of supersaturated, nanocrystalline rich-Ag and richNi solid solutions. The grain sizes of Ag and Ni particles remain nanosize after hot pressing at 620℃. The MA Ag50Ni50 alloy possesses excellent density and shows little oxidation. The formation mechanism of the meshwork of richAg was also evaluated.
Key words: mechanical alloying； hot pressing； nanocrystalline； Ag50Ni50
