新型Al-Ti-B-RE中间合金的合成及其细化性能的研究（英文）  

Synthesis and Refinement Performance of the Novel Al-Ti-B-RE Master Alloy Grain Refiner

作　　者：王正军[1,2] 司乃潮[1] 

机构地区：[1]江苏大学,江苏镇江212013 [2]宿迁学院江苏宿迁223800

出　　处：《稀有金属材料与工程》2015年第12期2970-2975,共6页Rare Metal Materials and Engineering

基　　金：Natural Science Foundation of Jiangsu Province of China(BK2011524);Natural Science Foundation of Education Department of Jiangsu Province of China(12KJD430002);Project Supported by Graduate Research and Innovation of Jiangsu University in 2014,Jiangsu Province,China(KYXX_0001)

摘　　要：为优化铝中间合金细化剂的组织,提升细化性能,采用熔配法工艺合成新型Al-Ti-B-RE中间合金晶粒细化剂,合成反应基于热力学和动力学分析是可能的、存在的、自发向右进行,在适当的工艺条件下,在基体中可生成均匀弥散分布的第二相Al_3Ti、TiB_2、Ti_2Al_(20)RE等粒子。采用X射线衍射(XRD)、扫描电镜(SEM)、光学显微镜(OM)和力学拉伸试验等分析方法对所合成材料的微观组织、细化效果及力学性能进行了表征。细化试验表明:自制的Al-5Ti-1B-1RE中间合金细化工业纯铝时,其平均晶粒尺寸小于150μm到达细晶粒度级别。拉伸试验表明:工业纯铝中加入0.2%自制的Al-5Ti-1B-1RE中间合金晶粒细化剂后有更优的机械性能,与未细化工业纯铝相比,抗拉强度提高了28.39 MPa,延伸率增加了29.97%,其性能明显优于某国产的Al-5Ti-1B丝中间合金细化剂。To obtain better microstructures, a new aluminum grain refiner, Al-Ti-B-RE master alloy, was synthesized by the mix-molten method. Analyzed by thermodynamics and kinetics, the synthesis reactions of Al-Ti-B-RE master alloy would be possible, existent and to the right spontaneously. The second phase particles of the Al-Ti-B-RE master alloy mainly contained Al3Ti, TiB2 and Ti2Al20RE, etc. Under appropriate conditions, the second phase particles could be distributed homogeneously in the matrix. The morphology and the distribution of second phases of Al-Ti-B-RE master alloy, refining effects and mechanical properties were studied by XRD, SEM, OM and the electron all-purpose test machine （CSS-44100）. The refinement experiment indicates that the self-made Al-5Ti-1B-1RE master alloy can refine the commercial pure aluminum into the level of the average grain size less than 150 μm, which belongs to the fine grain category. The tensile testing results show that after the addition of 0.2% self-made Al-5Ti-1 B-1 RE master alloy grain refiner into the commercial pure aluminum, the mechanical properties are improved significantly. Under the same condition, compared with the commercial pure aluminum without refmement, tensile strength ab and elongation are increased by 28.39 MPa and 29.97%, respectively. It is evident that the self-made Al-5Ti-IB-1RE master alloy grain refiner is superior to some domestic Al-5Ti-1B grain refiner.

关 键 词：熔配法 Al-Ti-B-RE中间合金 第二相粒子 细晶粒度级别 

分 类 号：TG146.21[一般工业技术—材料科学与工程]