ZHOU Guo-ping
,
LIU Zhen-yu
,
YU Shi-chuan
,
CHEN Jun
,
QIU Yi-qing
,
WANG Guo-dong
钢铁研究学报(英文版)
The formation of phosphorous surface inverse segregation (SIS) in twin-roll cast strips of low-carbon steels was studied. High phosphorous strips were fabricated by using a pilot twin-roll strip caster and a melt/substrate contacting apparatus, respectively. Solidification structures of strips were observed and analyzed, and phosphorus distributions along longitudinal sections of strips were investigated and discussed. The results showed that solidification structures of all strips were columnar grains, either integrated or coarse in the strip made by the melt/substrate contacting apparatus or damaged in some degree in cast strips; and that during cast strip solidification, enrichment of phosphorus occurred between columnar grains, and the average phosphorus concentration near the surface in the strip with 015% of phosphorus was measured to be about 027% which was obviously higher than that in the bulk.
关键词:
strip casting
,
phosphorus enrichment
,
inverse segregation
,
steel
,
solidification
中国腐蚀与防护学报
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关键词:
Journal of Materials Research
Based on the best bulk metallic glass (BMG) forming alloy in the Mg-Cu-Y ternary system, we introduced Ag (or Ni) to partially substitute for Cu to improve the glass-forming ability (GFA). The objective of this paper is twofold. First, we illustrate in detail a recently developed search strategy, which was proposed but only briefly outlined in our previous publication [H. Ma, L.L. Shi, J. Xu, Y. Li, and E. Ma: Discovering inch-diameter metallic glasses in three-dimensional composition space. Appl. Phys. Lett. 87, 181915 (2005)]. The protocol to navigate in three-dimensional composition space to land large BMGs is spelled out step-by-step using the pseudo-ternary Mg-(Cu,Ag)-Y as the model system. Second, our ability to locate the best BMG former in the composition tetrahedron allows us to systematically examine, and conclude on, the effects of a given alloying element. The large improvement in glass-forming ability in the Mg-(Cu,Ag)-Y system relative to the based ternary will be contrasted with the reduced glass-forming ability in the Mg-(Cu,Ni)-Y pseudo ternary system. It is demonstrated that the improvement of glass-forming ability requires judicious choice of substitutional alloying elements and concentrations, rather than simple additions of multiple elements assuming the "confusion principle."
关键词:
bulk metallic-glass;shaped copper mold;amorphous-alloys;thermal-stability;ternary-system;casting method;p system;diameter;zr;mm
王浩
,
刘国权
,
秦湘阁
金属学报
采用Potts模型Monte Carlo方法对3种现存的三维个体晶粒长大速率拓扑依赖性
方程进行了仿真验证. 结果表明, Rivier速率方程认为晶粒
体积变化率dVf/dt与晶粒面数f成线性关系, 与仿真
结果明显不符, 不适用于描述三维晶粒长大过程的动力
学. 当晶粒面数f≥8时, Yu-Liu速率方程和
MacPherson-Srolovitz速率方程均与仿真结果很好吻合,
表明这两者均可以用来定量描述三维晶粒长大过程的动力学;当
f<8时, 这两个方程均与仿真结果有显著差异.
关键词:
三维晶粒长大
,
topology-dependent grain growth rate equation
王浩
,
刘国权
,
秦湘阁
金属学报
doi:10.3321/j.issn:0412-1961.2008.01.003
采用Potts模型Monte Carlo方法对3种现存的三维个体晶粒长大速率拓扑依赖性方程进行了仿真验证.结果表明,Rivier速率方程认为晶粒体积变化率dVf/dt与晶粒面数,成线性关系,与仿真结果明显不符,不适用于描述三维晶粒长大过程的动力学.当晶粒面数f≥8时,Yu-Liu速率方程和MacPherson-Srolovitz速率方程均与仿真结果很好吻合,表明这两者均可以用来定量描述三维晶粒长大过程的动力学;当f<8时,这两个方程均与仿真结果有显著差异.
关键词:
三维晶粒长大,拓扑依赖性长大速率方程,Potts模型,Monte Carlo仿真
李文琳
,
李章炜
,
幸七四
,
张扬
贵金属
膜片开关用银浆制备使用的有机体系中,树脂、溶剂和添加剂对产品的性能和有害元素控制有重要的意义。经对比实悚,以热塑性聚酯为主体树脂,以MEA混合溶剂为溶剂,以YU-201、硅烷偶联剂以及自制增强塑性材料M-17材料为混合添加剂,制成有机载体。使用该载体制备出的浆料符合膜片开关银浆性能要求,且满足欧盟RoHS指标卤素控制要求。
关键词:
复合材料
,
环保型
,
无卤素
,
膜片开关
,
银浆