( 1. 華中科技大學(xué) 材料科學(xué)與工程學(xué)院， 武漢 430074;
2. 南昌航空工業(yè)學(xué)院 材料系， 南昌 330000)
摘 要: 采用激光焊接技術(shù)連接塊體非晶合金Zr45Cu48Al7(摩爾分?jǐn)?shù),%)。 結(jié)果表明： 在焊接熱循環(huán)作用下， 熔化區(qū)和熱影響區(qū)的晶粒形貌和組織具有很大的差異； 焊接速率為2m/min時(shí)， 熔化區(qū)主要生成τ5(Zr38Cu36Al26)、 ZrCu和一未知相， 熱影響區(qū)主要生成ZrCu相; 焊接速率為4m/min時(shí)， 熔化區(qū)保持了非晶特性， 熱影響區(qū)部分晶化， 其主要生成相為ZrCu相; 熱影響區(qū)的晶化行為與非晶合金熱處理過程的晶化行為有一定的區(qū)別， 其主要原因是激光焊接時(shí)的高速加熱及冷卻過程對各晶化相生長速率影響程度不同。
關(guān)鍵字: 塊體非晶合金； 激光焊接； 熱影響區(qū)； 熔化區(qū)； 晶化行為； 熱循環(huán)
（ 1. School of Materials Science and Engineering,
Huazhong University of Science and Technology, Wuhan 430074, China;
2. Department of Materials Science and Engineering,
Nanchang Institute of Aeronautical Technology, Nanchang 330000, China）
Abstract: Using a laser welding method, two pieces of bulk metallic glasses (BMGs)based on Zr45Cu48Al7 (mole fraction, %) were welded. The results indicate that the morphology and the structure in heat-affected zones (HAZs) are different from those in molten zone. When the welding speed is 2m/min, the majority of the crystalline phases in the molten zone are found to be τ5(Zr38Cu36Al26), ZrCu and an unknown phase, those in the HAZs are mainly ZrCu phase. While the welding speed is 4m/min, the molten zone keeps amorphous, HAZ is the discontinuous crystalline zone and the majority of the crystallites in HAZ are ZrCu phase. The crystallization behavior in HAZ is different from that of BMGs during heat-treating process, the main cause is that the effect on the growth speed of crystallization phases is different during the rapid heating and cooling process of laser welding.
Key words: bulk metallic glass; laser welding; heat-affected zone; molten zone; crystallization behavior; thermal cycle
