形成能力的影響
(太原重型機械學(xué)院 材料科學(xué)與工程分院，太原 030024)
摘 要: 研究了反復(fù)熔煉對Zr60Al15Ni25和Zr65Al7.5Ni10Cu17.5合金的玻璃形成能力的影響。 DSC分析表明， 隨著熔煉次數(shù)的增多， Zr60Al15Ni25非晶合金的玻璃轉(zhuǎn)變溫度和晶化開始溫度都提高，而Zr65Al7.5Ni10Cu17.5非晶合金的特征溫度基本沒有發(fā)生變化。 Zr60Al15Ni25合金的熔化焓由于反復(fù)熔煉而降低，在熱力學(xué)上有利于非晶相的形成。 根據(jù)反復(fù)熔煉對鑄錠凝固組織進而對合金熔體中的短程序的影響， 討論了玻璃形成能力的變化及原子間的結(jié)合力對短程序尺寸的影響， 分析了2種合金對反復(fù)熔煉處理的敏感性的不同。
關(guān)鍵字: 大塊非晶合金; 玻璃形成能力; 短程序
（Department of Materials Science and Engineering,
Taiyuan Heavy Machinery Institute,Taiyuan 030024, China）
Abstract:The effects of repetitive melting on the glass forming ability (GFA) of Zr60Al15Ni25 and Zr65Al7.5Ni10Cu17.5 were investigated. The results of DSC curves indicate that the glass transition temperature and the crystallization onset temperature of Zr60Al15Ni25 alloy increase as melting times increase. However, the characteristic temperatures of Zr65Al7.5Ni10Cu17.5 alloy scarcely change after repetitive melting. The reducing of fusion enthalpy of Zr60Al15Ni25 alloy after repetitive melting contributes to the suppressing of the nucleation of the primary phase. The improvement of the GFA of Zr60Al15Ni25 alloy is attributed to the smaller size of short-range orders, inheriting from the solidification structure of the ingot, after repetitive melting. Based on the fact that the attraction interaction of different species atoms controls the size of short-range orders in the liquid, the different sensitivity of the two alloys to repetitive melting was discussed.
Key words: bulk glassy alloy; glass forming ability; short-range
