共搜索到18985条信息,每页显示10条信息,共1899页。用时:0小时0分0秒401毫秒
Trans. Nonferrous Met. Soc. China 22(2012) 1582-1587 High temperature oxidation behavior of directionally solidified NiAl-31Cr-2.9Mo-0.1Hf-0.05Ho eutectic alloy WANG Zhen-sheng1,2, XIE Yi2,3, GUO... 2012 Abstract: The isothermal oxidation behavior of NiAl-31Cr-2.9Mo-0.1Hf-0.05Ho directional eutectic alloy was investigated with the help of scanning electron microscopy and X-ray diffraction......
Nucleation and growth of eutectic cell in hypoeutectic Al-Si alloy SUN Yu1, PANG Shao-ping1, LIU Xue-ran1, YANG Zi-run1, SUN Guo-xiong2 1. School of Materials Engineering, Yancheng Institute... of eutectic cell in hypoeutectic Al-Si alloy was investigated using optical microscopy and scanning electron microscopy equipped with electron backscattering diffraction (EBSD). By revealing......
of the as-cast ZK60 alloy is mainly composed of network eutectic (α-Mg+MgZn) and divorced eutectic MgZn, which semi-continuously distribute along the grain boundaries or in the interdendritic area... is different from that forms during eutectic reaction, precipitate after aging treatment. Key words: wrought magnesium alloy; ZK60; microstructure; alloy phase; MgZn2; eutectic 1 Introduction ZK60 alloy......
添加合金元素改善Au-Ge钎料组织及性能的研究进展王子伊,薛松柏,王剑豪,刘晗,温丽南京航空航天大学材料科学与技术学院摘 要:现如今电子行业纷纷开展了无铅钎料的研究工作,但是对用于高温环境下的无铅钎料的研究十分有限.对于熔化温度在280~400℃范围内的无铅钎料,Au-Sn,Au-Ge,Au-Si等金基钎料已逐步代替传统的高铅钎料,被广泛应用于微电子的耐高温封装领域.其中,Au-Ge合金具有良好的导电性,导热性,耐腐蚀性和高抗拉强度等优点,其耐高温性能明显优于Au-Sn,Au-Si钎料,尤其适用于高温环境.然而,Au-Ge钎料固有的缺点严重影响了其生产应用:一方面,由于Ge元素的存在,Au-Ge合金脆性较大,导致其难以加工成型,产品性能差,成品率低,严重影响了该钎料的推广使用.另一方面,Au-Ge钎料......
......
Eutectic nucleation in Al-25wt.% Si alloy through DSCWU Yuyinga, b, LIU Xiangfaa, JIANG Bingganga, and HUANG Chuanzhenb aKey Laboratory for Liquid-Solid Structural Evolution and Processing... the activation energy as well as nucleation work of eutectic solidification, can increase the eutectic nucleation frequency of Al-25wt.%Si alloy, so the addition of P can refine the eutectic structures......
on the solidification process and micro-structural characterization of Nb-Si eutectic alloy was studied. The microstructures of the Nb-Si composites were investigated by optics microscope (OM), X-ray... corresponds to 25% of the liquidus temperature. Contrasting to the conventional microstructure usually found in the Nb-Si eutectic alloy, the microstructure of the undercooled sample is divided......
......
......
="ChDivSummary" name="ChDivSummary">The influence of gravity on the solidification microstructure of Al-AI3Ni eutectic alloy was investigated by using a 50-m-long drop tube.It was found that at different... samples reduced progressively.Based on the experimental results and analysis,a physical model was proposed to describe the effect of gravity on the solidification process of eutectic alloy.关键词:......