Microstructure and microtexture evolution of undercooled Ni-15%Cu alloy  被引量:2

过冷Ni-15%Cu合金组织与微观织构演化规律(英文)

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作  者:李圣[1] 王海丰[1] 刘峰[1] 

机构地区:[1]西北工业大学凝固技术国家重点实验室,西安710072

出  处:《Transactions of Nonferrous Metals Society of China》2013年第11期3265-3270,共6页中国有色金属学报(英文版)

基  金:Project(2011CB610403)supported by the National Basic Research Program of China;Project(51125002)supported by the National Natural Science Fund for Distinguished Young Scholars of China;Projects(51101122,51071127,50901059)supported by the National Natural Science Foundation of China;Project(1110502)supported by the Fok Ying Tong Education Foundation,China;Projects(66-QP-2010,24-TZ-2009)supported by the Free Research Fund of State Key Laboratory of Solidification Processing,China;Project(B08040)supported by the Program of Introducing Talents of Discipline to Universities,China

摘  要:Rapid solidification of undercooled Ni-15%Cu (mole fraction) alloy was studied using glass fluxing and cyclic superheating. To show the effect of cooling history on the microstrucyure and microtexture evolution, the as-solidified samples were either cooled naturally or quenched into water after recalescence. At low undercooling, grain-refined microstructure has a random texture and a highly oriented texture without annealing twins for the case of naturally cooling and quenching, respectively. At high undercooling, a fully random texture as well as a number of annealing twins are observed, and recrystallization and grain growth independently happen on the cooling history. Fluid flow and recrystallization play an important role in the microtexture formation for grain refinement at both low and high undercooling.采用熔融玻璃净化和循环过热方法实现Ni-15%Cu(摩尔分数)合金的深过冷。采用再辉后自然冷却和水淬两种方式研究凝固冷却对凝固组织和微观织构的影响。在小过冷度下,自然冷却条件下晶粒细化组织呈随机位向,而快淬条件下晶粒细化组织呈集中位向,但均无退火孪晶;在大过冷度下,晶粒细化组织呈随机位向,大量退火孪晶出现,再结晶和晶粒长大发生。分析表明:在小过冷度和大过冷度下的晶粒细化组织的微观织构形成过程中,对流和再结晶起重要作用。

关 键 词:solidification UNDERCOOLING grain refinement MICROTEXTURE Ni-Cu alloy 

分 类 号:TG146.15[一般工业技术—材料科学与工程]

 

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