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°and the deviation of preferred orientation is about 30° for this selector. Key words: DZ417G alloy; high rapid solidification; crystal orientation; single crystal superalloy; spiral grain selector Cite... crystal (SX) [3]. The transition from DS to SX can be achieved by introducing a crystal selector which consists of two parts: a starter block referring to the grain orientation optimization and a spiral......
temperature. One is to decrease the axial ratio (c/a) of magnesium crystal through adding alloying agents, such as Li, In and Ag[3]; the other is grain refinement to accommodate the slipping of the basal face... is obtained when grain size is 1 μm at room temperature[6]. As the non-crystal magnesium is not easily obtained[7-11], the new processes are expected. Because of the particularity of crystal structure......
of the primary phase (α-Mg) decrease to approximate 40% that of the initial primary crystal, from about 530 μm to 200 μm around. The electromagnetic stirring processing not only decreases the grain sizes... stirring" processing improves grain shape of α-Mg further and refines grain size to about 72 μm, less than 15% that of the initial primary crystal. Key words: melt treatment; electromagnetic stirring......
to investigate the grain refinement is to check the cast microstructure which however cannot provide complete information about primary crystal nucleation as ROHATGI and ASTHANA[4] suggested... latent heat and elimination of heat [11, 15-16]. For grain refinement, the latent heats mainly relate to the nucleation and growth of primary crystal α-Mg. The grain size decrease with increasing......
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Low-Angle Grain Boundaries in Sublimation Grown 6H-SiC Crystals Jiang Shouzhen1,Chen Xiufang1,Xu Xiangang1,Dong Jie1,Li Xianxiang1,Hu Xiaobo1 (1.State Key Laboratory of Crystal Materials, Shandong... of low-angle grain boundaries (LB) is close relative to the inclination of the crystal interface. At the central faceted region with 0° inclination the crystal is of high structural perfection. However......
Grain refinement and plastic formability of Mg-14Li-1Al alloy JIANG Bin(蒋 斌)1, 2, YIN Heng-mei(殷恒梅)2, LI Rui-hong(李瑞红)1, 2, GAO Liang(高 亮)1, 2 1. National Engineering Research Center... master alloy on the grain size of LA141 alloy was investigated as well as the effects of the total reduction of cold rolling and the annealing temperature on microstructure, mechanical properties......
an obvious refinement effect on the cast grain of magnesium and its alloys without the alloy element Al because the crystal structure of zirconium is the same as magnesium matrix, and the lattice... of cerium is that it increases the liquid constitutional undercooling that can provide a heterogeneous crystal nucleation for the alloy. Key words: Mg alloy; grain refinement; zirconium; cerium......
of devices, machine and structural systems. Since NC materials are characterized by their high volume fraction of grain boundary which may comprise as much as 10%-30% of the total crystal volume[2... Effect of grain size on corrosion behavior of electrodeposited bulk nanocrystalline Ni QIN Li-yuan(秦丽元), LIAN Jian-she(连建设), JIANG Qing(蒋 青) Key Laboratory of Automobile Materials of Ministry......