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小蘭花銀蟲(chóng) (著名寫(xiě)手)
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從圖6可見(jiàn)，在第二相粒子含量較多（f>5%）時(shí)，第二相粒子含量越多，兩類(lèi)曲線分離越明顯。在相同模擬時(shí)間下，棒狀比圓形第二相粒子的晶粒平均尺寸小，說(shuō)明棒狀第二相粒子釘扎效果比圓形第二相粒子更好。因?yàn)閳A形第二相粒子是等軸粒子，其空間對(duì)稱性好而沒(méi)有取向差異，對(duì)晶粒演化的限制較�。话魻畹诙嗔Ｗ邮欠堑容S粒子，在基體中就會(huì)有一定的空間幾何取向，從圖1(c)和圖2(c)可以發(fā)現(xiàn)，晶界與棒狀第二相粒子之間的接觸幾乎都是線接觸，晶粒沿垂直于棒狀第二相粒子長(zhǎng)度方向的長(zhǎng)大過(guò)程受到抑制，使晶界呈現(xiàn)方向性，所以棒狀第二相粒子對(duì)于晶粒組織長(zhǎng)大的釘扎作用必然大于圓形第二相粒子。 專(zhuān)業(yè)詞匯： 棒狀第二相：spherical second-particles 圓形第二相：stick second-particles |
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2樓2010-06-24 07:36:29
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| From Figure 6 it can be seen,when particle content is higher in the second phase(f> 5%) ,The more content of second-phase particles, the more obvious separation of two curves.Under the same simulation time,the average size of the abar-shaped crystal grain smaller than the spherical second-particles, Description rod second-phase particles pinning effect better than the circular second phase particles.Because the circular second-phase particles are equiaxed particles,No difference in orientation due to good spatial symmetry,Less restrictive to the evolution of the grain.Rod second-phase particles are non-equiaxed particles,which will have a certain geometric orientation in the matrix ,from Figure 1 (c) and Figure 2 (c) can be found,almost all of the contacts are line contact between boundary and stick second-particles particles ,the growth process of the Grain along the length direction of the stick second-phase particles is inhibited,which lead to show the direction of grain boundary,Therefore, the pinning effect of second phase particle for the grains of grew up in an inevitable larger than spherical second-particles . |
3樓2010-06-27 20:25:12
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小蘭花(金幣+10):謝謝幫忙！ 我先思考一下先。 2010-06-28 20:06:39
| From Figure 6 it can be seen,when particle content is higher in the second phase(f> 5%) ,The more content of second-phase particles, the more obvious separation of two curves.Under the same simulation time,the average size of the stick second-particles crystal grain smaller than the spherical second-particles, Description rod second-phase particles pinning effect better than the spherical second-particles .Because the spherical second-particles are equiaxed particles,No difference in orientation due to good spatial symmetry,Less restrictive to the evolution of the grain.Rod second-phase particles are non-equiaxed particles,which will have a certain geometric orientation in the matrix ,from Figure 1 (c) and Figure 2 (c) can be found,almost all of the contacts are line contact between boundary and stick second-particles particles ,the growth process of the Grain along the length direction of the stick second-phase particles is inhibited,which lead to show the direction of grain boundary,Therefore, the pinning effect of second phase particle for the grains of grew up in an inevitable larger than spherical second-particles . |
4樓2010-06-27 20:38:50
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