摘要
制备了具有良好玻璃形成能力的Cu52.5Ti30Zr11.5Ni6大块非晶合金,其临界直径达到5mm,临界冷却速率约为126.8K/s。采用Jackson-Hunt公式计算了晶化组织形成的冷却速率。当冷却速率在10K/s～120K/s时,晶化组织则出现亚稳初生相与共晶共存的形态。当冷却速率低于10K/s时,亚稳初生相的析出将被逐渐抑制,使得共晶生长方式发生改变。
Bulk amorphous Cu52.5Ti30Zr11.5Ni6（at.%） alloys up to 5 mm in diameter were fabricated by a copper mold casting method. The critical cooling rate was determined to be 126.8 K/s by using the Barandiaran-Colmenero expression. Based upon the Jackson-Hunt relation, the cooling rate for the formation of devitrified structure was also evaluated. In the cooling range of 10 K/s - 120 K/s, there exists a mixed microstructure of primary metastable phase and eutectic structure. With further decreasing of cooling rate （below 10K/s）, the precipitation of metastable phase was depressed, and the growth mode also deviates from the cutectic mode.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期236-240,共5页
Rare Metal Materials and Engineering
关键词
铜基大块非晶合金
临界冷却速率
共晶组织
Cu-Based bulk amorphous alloy
critical cooling rate
eutectic microstructure
