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. 3.6 Discussion 3.6.1 Solidification process of transition layer The cooling curve shown in Fig. 7 can be used to confirm that the chilling effect of the Cu plate on the liquid Al does not form...Trans. Nonferrous Met. Soc. China 26(2016) 2247-2256 Solidification process and microstructure of transition layer of Cu-Al composite cast prepared by method of pouring molten aluminum Shu-ying CHEN......
during slow cooling process after stirring was investigated. The effects of the solidification rate on the microstructure of the semi-solid slurry were investigated under three different solidification..., and at last coarsened eutectic Si appears. Primary Al grains with different sizes and eutectic Si are obtained, corresponding to three different solidification rates. Key words: gas bubble stirring......
with Bi addition of 0.05%, 0.1%, 0.3% and 0.5%. The first derivative curve (dTC/dt) was also plotted in addition to cooling curve to be used as an indicator of phase transformation during solidification... and strontium on the eutectic silicon structure in Al-7Si-0.4Mg alloys were investigated under different solidification conditions. The results show that bismuth has a refining effect on the eutectic silicon......
Microstructure characteristics and solidification behavior of thixomolded Mg-9%Al-1%Zn alloy ZHANG You-fa1, LIU Yong-bing2, CAO Zhan-yi2 1. Jiangsu Key Laboratory of Advanced Metallic Materials... were carried out to comprehensively understand the morphology transformation of solid particles and the solidification behavior. Typical microstructure of thixomolded AZ91D is composed of α-Mg......
of the cooling rate ranging from 1.4 °C/s to 3.5 °C/s on the solidification behavior of the sand-cast Mg-10Gd-3Y-0.4Zr alloy was studied by computer aided cooling curve analysis (CA-CCA... analysis program. The processing included smoothing, curve fitting, plotting the first derivatives, identifying the onset and end of solidification, determining solidification parameters such as cooling......
; (1) 式中:下标cc表示冷却曲线(cooling curve)；bl表示基线(baseline)；t1和ts分别表示凝固开始和凝固结束时所对应的时间. 图3 求取合金凝固过程中温度参数的方法 Fig. 3 Determining method for temperature parameters during solidification RIDDLE等[22]介绍了使用双热电偶法的另一种分析凝固曲线方法,即使用ΔT-t曲线ΔT=Te-Tc.其中,下标e为edge的缩写,代表边缘热电偶；下标c为center的缩写,代表中心热电偶[23-24].图4所示为Tcoh求取方法的示意图.如图4所示,以MgZn4.5Y0.5Zr0.5合金为例,ΔT-t曲线出......
"temperature plateau" appears on the cooling curve of the quenching surface. The temperature range of this plateau is 160-170 °C with the duration about 3 s. During the temperature plateau, heat...; synthetic surface heat transfer coefficient; cooling curve 1 Introduction 7B50 alloys, as one of 7xxx series ultra-high- strength aluminum alloys, are widely used in the aerospace industry due......
solidification were adopted to study the effects of Ni and Mn on the microstructure, solidification process and aging hardening characteristics of Al Si Cu Mg alloy. The results show that while the content of Ni...> aluminum alloy; solidification process; aging hardening; Received: 2000-01-03 Al-Si-Cu-Mg合金具有高的强度, 低的热膨胀系数和良好的铸造性及耐磨性, 广泛应用于制造活塞, 汽缸体, 汽缸盖, 曲轴箱等铸件 [1,2,3] . 近年来, 为了适应......
precipitate cluster, as described before. From the DSC results of various Mg-Al-Zn alloys, there are two (sets of) peaks in each DSC curve recorded during solidification, corresponding to the melting... to granule. Key words: Mg alloys; Mg-Al-Zn alloys; microstructure; intermetallic compounds; solidification 1 Introduction Mg-Al-Zn based magnesium alloy is the most widely used alloy system currently......
spring curve, the traditional gaugemeter automatic gauge control (GM-AGC) system based on spring equation cannot meet the requirements of practical production. In allusion to this problem, a kind of novel GM-AGC system based on mill stretch characteristic curve was proposed. The error existing in calculating strip thickness by spring equation were analyzed first. And then the mill stretch......
