1) plate-like WC grain
板状晶WC
1.
By comparing the microstructures of WC-20Co-1Y_2O_3 cemented carbides by hot-press at the temperature below the eutectic melting temperature and conventional liquid phase sintering, it is shown that the plate-like WC grain is formed through the mechanism of dissolution/reprecipitation process (recrystallization) .
采用超细WC原料 ,在WC 2 0Co合金中加入纳米Y2 O3,在 1 4 4 0℃的液相烧结温度下获得了含板状晶WC双模组织结构的合金。
2) plate-like shape WC grains
板状WC晶粒
1.
A general technical was used to produce WC-12wt%Co alloy with plate-like shape WC grains in this paper, it was prepared using common W powder?Co powder and graphite powder as raw materials.
合金显微组织正常,含有大量板状WC晶粒。
3) plate-like WC seeds
板状WC晶种
1.
WC-10%Co and WC-20%Co cemented carbide with plate-like WC grains were prepared by adding plate-like WC seeds.
通过加入板状WC晶种制备含板状WC晶粒的WC-10%Co和WC-20%Co硬质合金,研究了加入板状WC晶种对两种硬质合金显微组织和性能的影响。
4) fibrous WC grain
纤维状WC晶粒
1.
Fabrication of WC-Co alloy with fibrous WC grains;
纤维状WC晶粒硬质合金的制备
5) Rod-like WC Grain
长棒状WC晶粒
6) plate-like grain
板状晶粒
1.
Based on classical theory of surface diffusion and evaporation-condensation, a fi- nite element program is developed to simulate the unstable shape evolution of plate-like grains.
基于物质表面扩散和蒸发-凝结的经典理论,对板状晶粒不稳定外形的演变过程进行了有限元模拟结果表明,热蚀沟角θ=0(无内晶界)时,板状晶粒将直接圆柱化;当内晶界存在时,存在一临界热蚀沟角θmin;当θ>θmin时,板状晶粒沿晶界分离。
补充资料:铝合金的羽毛状晶
铝合金的羽毛状晶
feathey crystal of aluminium alloy
IUheJ旧deyumooZhuangJ旧g铝合金的羽毛状晶(feathey Crystal of alu-minium anoy)铝合金铸锭中柱状晶的变种,形状类似羽毛的晶粒。是铸锭缺陷的一种。形状近似直线状花边的羽毛状晶亦称为“花边状组织”。羽毛状晶成群出现,每群中羽毛状晶之间近似平行。羽毛状晶是双晶,以(111)晶面为双晶面。铝一镁系合金中的羽毛状晶如图所示。’ 产生羽毛状晶的工艺因素主要是:(1)熔体处于高温平稳状态,有较好的定向结晶条件。(2)在铸造温度下熔体停留时间过长,熔体过热和高度净化,减少结晶前沿形成晶核的数量。(3)合金中加入某些容易产生羽毛状晶的微量元素,如硼和错。 超硬铝合金、工业纯铝和高镁铝合金形成羽毛状晶的几率较大,而高强锻造铝合金2A70(LD7)、防锈铝合金 3A21(LF21)和含镁低于5%的铝镁系合金,基本上不形成羽毛状晶。 铸锭中存在羽毛状晶对其性能影响较大。在塑性加工过程中易在羽毛状晶的双晶面处产生裂纹。制品中残留的未完全破碎的羽毛状晶区会扩大使用性能的各向异性。蘸: 铝一镁系合金铸锭中的羽毛状晶偏光只100 (格长清)
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