不同熔体热处理工艺后Al-Cu-Ti合金的晶粒细化及力学性能改善  

Grain Refinement and Mechanical Properties Improvement of Al-Cu-Ti Alloys After Different Melt Heat Treatment Processes

作　　者：王琳[1] 孙昱 薄琳 左敏[1] 赵德刚[1] Wang Lin;Sun Yu;Bo Lin;Zuo Min;Zhao Degang(University of Jinan,Jinan 250022,China)

机构地区：[1]济南大学,山东济南250022

出　　处：《稀有金属材料与工程》2020年第8期2615-2622,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51772132);Natural Science Foundation of Shandong Province of China(ZR2019MEM019)。

摘　　要：研究了添加细化剂和不同热处理工艺(过热处理和热速处理)对Al-Cu合金的改性。分析了Al-Cu-Ti合金的相组成、凝固微观组织和力学性能。此外,采用差示扫描量热法(DSC)研究了Al-Cu-Ti合金在不同熔体热处理工艺后的熔体结构转变行为。实验结果表明,热速处理极大地细化了Al-Cu-Ti合金晶粒,且力学性能得到有效改善。通过对热力学相变分析,发现Al-Cu-Ti合金经过热处理和热速处理后的熔化潜热随着界面能的增大而变小,从而在一定程度上细化了合金的微观组织。The modification of Al-Cu alloy by adding grain refiner combined with different heat treatments(superheat treatment and thermal rate treatment)was investigated.The phase composition,solidification microstructure and mechanical properties of Al-Cu-Ti alloys were analyzed.Moreover,the melt structure transformation of Al-Cu-Ti alloys after different melt heat treatments was studied by DSC.The results show that the thermal rate treatment greatly refines the grain of Al-Cu-Ti alloy and improves the mechanical properties.Through the analysis of thermodynamic phase transition,it is found that the latent heat of fusion of Al-Cu-Ti alloy after superheat treatment and thermal rate treatment becomes smaller with the increase of interfacial energy,which refines the microstructure of the alloy to some extent.

关 键 词：熔体热处理工艺 熔体结构 凝固组织 晶粒细化 力学性能 

分 类 号：TG156[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]