【摘 要】
：
The solidification of Sn-Ni peritectic alloys in which both the primary Ni3Sn2 and peritectic Ni3Sn4 phases were intermetallic compound phases (IMCs) with narrow solubility ranges was investigated through con-focal laser scanning microscope.Analysis on th
【机 构】
：
School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China;School of Physics
论文部分内容阅读
The solidification of Sn-Ni peritectic alloys in which both the primary Ni3Sn2 and peritectic Ni3Sn4 phases were intermetallic compound phases (IMCs) with narrow solubility ranges was investigated through con-focal laser scanning microscope.Analysis on the interface migration at different cooling rates shows that the rate of peritectic reaction is much smaller than previous reports,and the growth of peritectic phase is mainly attributed to direct precipitation from the melt in Sn-Ni alloy after peritectic reaction.In addi-tion,different from other peritectic alloys where the solidified phases are solid solution phases,the “step”growth of both Ni3Sn2 and Ni3Sn4 phases was observed.The dependences of the step thickness on both the cooling rate and solidification time were measured,which shows that the step thicknesses of both phases gradually decrease as solidification proceeds.This was confirmed to be attributed to the difference between the actual and equilibrium melt concentrations during solidification.In addition,the increase of the normal growth velocity of Ni3Sn4 phase with increasing cooling rate was also proved through both the experimental observation and quantitative prediction.
其他文献
Cu content has been successfully optimized in a thixo-cast and directly aged (T5-treatment) Al-7Si-0.5Mg (wt.％) alloy.Even after the 0.5％ Cu addition,plate-like Al2Cu (θ\') phases,which contribute to high strengths and large plasticity,are precipitated.
3D-printing is an emerging technology that challenged wrought counterparts by one-step manufacturing for complicated biological devices.However,the material properties and surface features due to manu-facturing parameters play an important role on the cor
We present an electron backscattered diffraction (EBSD)-trained deep learning (DL) method integrating traditional material characterization informatics and artificial intelligence for a more accurate classifi-cation and quantification of complex microstru
In this study,the pitting corrosion behavior of 13Cr4Ni martensitic stainless steel (BASE) and that mod-ified with rare earth (REM) in 0.1 mol/L NaCl solution were characterized.Techniques such as automatic secondary electron microscope (ASPEX PSEM detect
High-strength pipeline steel was subjected to friction stir welding (FSW) at rotation rates of 400-700 rpm,and the grain refinement mechanism of the nugget zone (NZ) was determined.The thermo-mechanical process during FSW in the NZ was simulated by multi-
In this work,we used the selective laser melting (SLM) fabricated Co-Cr alloy with prominent residual strain,extremely non-equilibrium microstructures,and low stacking fault energy as a precursor to fab-ricate materials with the optimal grain boundary cha
The excellent properties of the multi-principal element alloys (e.g.,the CoCrNi medium-entropy alloy)make them a perfect candidate for structure materials.Their low strength and poor wear-resistance,however,limit considerably their applications.In this st
水资源滋养万物,让生命得以生生不息。但水火无情,溺水事故的发生让无数家庭陷入失去亲人的痛苦。世卫组织发布数据中提到,每年溺水身亡人数高达37万。本文通过调研溺水事故发生原因、溺水者心理感受,溺水事故典型情境分析,提出帮助溺水者有效自救和快速得到救援的防溺水装备设计方案。本文以溺水事故为线索,以防止溺水死亡事故发生为设计目标。首先,运用情境法对溺水事故进行情境片段分析。从溺水者角度、施救者角度对用户
青龙峡景区位于山西壶关县太行山南段的主脊地带,为国家级4A级景区,年接待游客约45万人次,旅游业是当地居民致富增收的支柱产业。同时,峡谷景区内山体陡峻,断层发育,岩体破碎,为地质灾害高发区,影响旅游业的经营和发展。本文将青龙峡景区划分为4个地质灾害风险等级区,旨在为景区防灾减灾提供技术依据,保护景区游客和居民安全,保障景区的安全运营。本论文依托“壶关太行山大峡谷旅游资源及地质环境评价”项目,以壶关
Bismuth-telluride (Bi2Te3) is considered to have the best thermoelectric properties at room temperature(ca.300 K).Thus,synthesis and improvement of Bi2Te3 and its derivatives quickly and cost-effectively at favorite temperatures are of interests.Recently,