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of the slow shot speed, the fast shot speed and the biscuit thickness on the externally solidified crystals (ESCs) were investigated. With the increase of the biscuit thickness, the number of the ESCs... parameters were also discussed. Key words: AM60B magnesium alloy; die casting; microstructure; externally solidified crystals 1 Introduction In a cold-chamber die casting process, the alloy melt......
die castings would get prominent. Key words: vacuum die casting; slow shot speed; porosity; externally solidified crystals 1 Introduction High-pressure die casting is one of the most commonly used... [7-11] and formation of externally solidified crystals (ESCs) [12-14] in the shot sleeve strongly depend on the slow shot speed as it can affect the flow behavior and solidification condition......
heat transfer behavior; metal-die interface; externally solidified crystals 1 Introduction Many works have proven that the heat transfer behavior at the metal-mold interface plays an important role... variation of the IHTC was found at position T1. The relevant microstructures are shown in Fig. 5. For both HPDC processes, the externally solidified crystals (ESCs) tend to aggregate in the center along......
考虑压室预结晶的镁合金压铸组织实验及模拟研究吴孟武1,熊守美1(1.北京市清华大学机械工程系汽车安全与节能国家重点实验室)摘 要:针对镁合金压铸件表层晶粒细小均匀而心部晶粒较粗大且不均匀的特点,开展一系列压铸实验,研究镁合金压铸工艺对压室预结晶和压铸件最终凝固组织(特别是对晶粒大小,压室预结晶组织的含量及分布形态)的影响.采用数值模拟方法,以压铸实验统计数据为基础,建立了考虑压室预结晶的镁合金压铸形核模型,以此模拟更接近实际的压铸组织.应用所建立的形核及生长模型,模拟了不同压铸工艺下AM50镁合金"阶梯"压铸件......
entrapment and formation of externally solidified crystals (ESCs) in the shot sleeve. Many numerical models have been developed and applied to investigating the flow behavior of molten metal in the shot... Optical micrograph showing region containing defect band from Fig. 3(c) (Band edges are marked by dotted lines) 3.3 Externally solidified crystals Figure 5 shows the typical etched micrographs from......
Microstructure refinement of AZ91D alloy solidified with pulsed magnetic field WANG Bin(汪 彬), YANG Yuan-sheng(杨院生), ZHOU Ji-xue(周吉学), TONG Wen-hui(童文辉) Institute of Metal Research, Chinese...; Abstract: The effects of pulsed magnetic field on the solidified microstructure of an AZ91D......
J. Cent. South Univ. Technol. (2008) 15(s1): 386-390 DOI: 10.1007/s11771-008-385-0 Influencing factors of compressive strength of solidified inshore saline soil using SH lime-ash QIN Yin-hui(覃银辉... of Geotechnical Engineering, Hohai University, Nanjing 210098, China) Abstract: Through unconfined compressive strength test, influencing factors on compressive strength of solidified inshore saline......
Research of {0001} crystal orientation for magnesium alloys solidified in a fashion of cellular crystalsGuo-wei Chang, Shu-ying Chen, Qing-chun Li, Xu-dong Yue, and Yi-hui Qi School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China摘 要:The magnesium alloy grew in a fashion of cellular crystals during......
Recrystallizaiton Behavior of Directionally Solidified DZ4 Superalloy TAO Chun-Hu1,LI Yun-ju1,ZHANG Wei-fang1 (1.Failure Analysis Center of AVIC, Beijing Institute of Aeronautical Materials, Beijing, China) 摘要:This article investigated effects of degrees of deformation, heat treatment temperatures and holding times on the recrystallization behavior of directionally solidified DZ4 superalloy......
Al-Li based alloys (SEM) (a) -1#; (b) -2#; (c) -3#; (d) -4# 图3 快速凝固铝锂合金样品晶体的衍射花样 (TEM) Fig.3 Diffraction partterns of crystals of rapidly solidified Al-Li based alloy specimen (TEM...技术研究课题资助项目! ( 863-71 5-1 6-0 1 -0 4 ); Effects of alloying elements on improving properties of rapidly solidified aluminum-lithium alloy Abstract: Through......
