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is 1497.5 MPa, and the elongation is 6.4%. Key words: titanium alloy; direct rolling; grain refining; tensile property Foundation item: Project (14-1122) supported by the Scientific Research Foundation...;Morphologies of α phase at grain boundary in Ti-B20-0.1B alloys after direct rolling 直接轧制对TiB的分布也产生了显著影响,热变形过程中压应力促使TiB晶须发生刚体转动[13, 16],主要沿着轧制方向排列.另外,TiB在轧制力的作用下发生了断裂,由于β基体具有高的塑性,TiB断裂后留下的孔洞能够被β基体弥合上.而......
evolutions of texture and grain boundary plane distributions in a ferritic stainless steelFANG Xiao-ying(方晓英)1, WANG Wei-guo(王卫国)1, GUO Hong(郭红)1, QIN Cong-xiang(秦聪祥)1, ZHOU Bang-xin(周邦新)2(1. School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China ；2. Institute of Materials, Shanghai University, Shanghai 200072, China)Abstract:The grain size, textures and grain......
Electrical Properties and Grain Growth Kinetics of PZN-based Ceramics Using Microwave Sintering CHOU Chen-chia1,LI Chen-liang1,M. B. Suresh1 (1.Advanced Ceramics Laboratory, Department... at 800℃ for 2 h. The small grain growth exponents indicate how easy the grain growth in these materials sintered using microwave radiation. Grain growth rate increases abruptly and is higher than......
of precipitation, substructure and grain refining. Key words: aluminum alloy; low-frequent electromagnetic casting; inhibit recrystallization; primary Al3(Sc,Zr) particles; secondary Al3(Sc,Zr) particles; substructure strengthening; precipitation strengthening; grain refining 1 Introduction As a novel lightweight structure material, Al-Zn-Mg-Cu alloy with high strength, high toughness, good......
master alloy for 0.1%Sr and melt holding time of 80 min, the AZ31 magnesium alloy is found to obtain a minimum average grain size of 62 μm. Key words: AZ31 magnesium alloy; Mg-Sr master alloy; grain refining; Mg17Sr2 phase 镁合金作为最轻质的商用金属工程结构材料,目前正逐渐应用于汽车,航空航天和电子等领域.由于变形镁合金可以获得比......
形核的异质形核质点. 图1 铸态合金晶粒的金相照片 Fig 1 OM images of grain structure in as-cast alloys with different Sm additions 对4组合金的α(Al)二次枝晶间距(Secondary dendrite arm spacing,SDAS)进行了统计,结果如图2所示.未添加Sm元素的S1合金... with increasing the Sm content. Key words: Al-7Si-0.3Mg aluminum alloy; rare earth Sm; microstructure; refining mechanism Foundation item: Project(51871035) supported by the Natural Science Foundation......
ON THE MONTE CARLO SIMULATION OF NORMAL GRAIN GROWTH L.J.Wang1,X.F.Ma1,Y.T.Liu1,X.M.Shen1,X.J.Guan1 (1.School of Materials Science and Engineering,Shandong University,Jinan 250061,China) Abstract:The microstructures and their kinetics of normal grain growth are simulated using different Monte Carlo (MC) algorithms.Compared with the relative figures and the theoretical normal grain growth......
of solidifying interface. This leads to the constitutional supercooling and makes the rate of grain nucleation increase. Therefore, the addition of Ce has refining effect on alloy. When the Ce addition is too high, the size of Al2Ce becomes larger and the amount of Al2Ce does not increase. This makes the refining effect becomes poor. Fig.2 Effect of Ce content on grain size Fig.3 XRD results......
. [2] 朱正锋, 兰晔峰. 铝及合金晶粒细化研究现状及发展趋势[J]. 铸造设备研究, 2004(2): 52?55.ZHU Zheng-feng, LAN Ye-feng. Status and development of the research on grain refining for aluminum alloys[J]. Casting Equipment Research... Jian-jun. A neotype grain refiner Al-Ti-B-RE[J]. Light Alloy Processing Technology, 2004, 32(2): 18?21. [14] FU Gao-sheng, CHEN Wen-zhe, QIAN Kuang-wu. Refining effect of a new Al3Ti1B1RE master alloy......
wire shows the best refining effect among all the refiners. The refining effect is improved with the increase of grain refiner addition amount. And the refinement effects become stable when Ti content... of N2 (99.9%); gas flow of 1.0, 1.2, 1.5, 2.0 L/s; rotary velocity of 100, 150, 200, 300, 450 r/min; degassing period 5, 10, 15, 20, 25 min. 2.2 Grain refining process To investigate the effect......
