杨振国
,
杜维玺
,
杜森林
,
刘素兰
金属学报
本文用阳极溶解计时电位法,对稀土金属La在液态Al-Si合金中的扩散系数进行了测定。结果表明,973K,La浓度18.0×10~(-4)mol·cm~(-3)时,La在Al-5.2wt-％Si合金液中的扩散系数平均值DLa(Al-SI)=(0.91±0.01)×10~(-5)cm~2·S~(-1)。...
关键词:
扩散系数
,
activation energy
,
La
,
Al-Si alloy
徐达鸣
,
李庆春
,
王永前
金属学报
应用定向凝固/重熔技术研究了Al-Cu,Al-Ni和Al-Si合金定向生长共晶组织的熔化行为实验结果表明:共晶组织的熔化过程与其凝固生长过程之间不存在完全的互逆性无论是规则片状或棒状共晶组织,或是不规则片状共晶组织,其熔化过程都是共晶组织的两相首先在熔化界面上同时分解,形成各自的分散相,然后这些成分...
关键词:
熔化行为
,
eutectic structure
,
Al-Cu alloy
,
Al-Ni alloy
,
Al-Si alloy
郄喜望
,
李捷
,
马晓东
,
张忠涛
,
李廷举
金属学报
在不同的恒温条件下,对Al-Si合金熔体进行不同时间的超声处理, 当超声处理时间为60 s时, 试样含气量显著降低, 除气效果明显. 在Al--Si合金凝固过程中施加超声场,晶粒发生球化、细化现象; 在Al-Si合金凝固区间恒温条件下施加超声场, 晶粒发生细化但未发生球化现象. 超声场作用下Al-S...
关键词:
超声场
,
Al-Si alloy
,
degassing effect
,
grain refinement
葛丽丽
,
刘日平
,
王强
,
王文魁
金属学报
利用电磁悬浮设备, 通过在真空状态下反复加热与冷却处理, 获得了Al50Si50 (原子分数)合金熔体的深过冷,
最大过冷度为320 K. 观察了不同过冷度下凝固样品小球的表面及其截面
深腐蚀后的组织形貌. 过冷度较小时, 初生相Si为板条状枝晶形貌, 并在其中发现了Al的
层状沉积；过冷度较大时,...
关键词:
过冷凝固
,
Al-Si alloy
Hengcheng LIAO
,
Guoxiong SUN
材料科学技术（英文）
Optical microscope and scanning electron microscope were used to observe the microstructure of the Al-11.6%Si and Al-11.6%Si-0.4%Mg alloys and the morphology of the massive silicon particles. It is found that the massive silicon phase, observed in the unfully modified alloys with 0.010%Sr, disappear...
关键词:
Al-Si alloy
,
null
,
null
,
null
LIU Qiyang LI Qingchun ZHANG Jiren Harbin Institute of Technology
,
Harbin
,
China LIU Qiyang
,
Division of Foundry
,
Department of Mechanical Engineering No.2
,
South China University of Technology
,
Guangzhou
,
China
金属学报(英文版)
By inserting the single crystal silicon seeds into Sr modified Al-22wt-% Si alloy melts,the fact that nucleation and growth of Si-phase are affected by Sr addition has been confirmed.It is suggested that this effect is caused by the adsorption of Sr on{111}_(si),and the modification of eutectic stru...
关键词:
Al-Si alloy
,
null
,
null
GUI Manchang
,
JIA Jun
,
SONG Guangchun
,
LI Peiyong
,
LI QingchunHarbin Institute of Technology
,
Harbin
,
China
金属学报(英文版)
In the light of DSC, electronic microprobe and X-ray diffration analyses of the melt-spinning ribbons and the structures of liquid hypoeutectic Al-7%Si, euteclic Al-12.7%Si and hypereutectic A1-18%Si alloys have been investigated. The results show that the Al-Si clusters in liquid hypoeutectic Al-Si...
关键词:
Al-Si alloy
,
null
,
null
