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首页> 外文会议>International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials(ISMANAM 2003); 20030824-20030828; Foz do Lguacu; BR >Effect of Mechanical Alloying on Structure and Hardness of TiAl-V Powders
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Effect of Mechanical Alloying on Structure and Hardness of TiAl-V Powders

机译：机械合金化对TiAl-V粉末结构和硬度的影响

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The TiAl-V alloys compositions were chosen within the γ-phase region up to maximum 20 at% vanadium. During high energetic milling of elemental powders formation of Al(Ti, V) solid solution was observed after 20 hours of milling. Longer milling caused amorphization of most of the material and formation of a metastable phase in the alloy of highest vanadium content. The particle size increased up 10 hours of milling time and then decreased. At higher vanadium content the shortest time necessary to obtain the final spherical shape and the amorphous structure was observed. The transmission electron microscopy studies of powders milled for 40 hours have shown some chemical nonhomogeneity of powder's particles. It was connected with a layered internal structure of powders. The mean Vickers microhardness of powders after 40 hours of milling ranged from the HV_(20) = 710 up to 955 for alloys containing 10 and 15 at. %V. The initial hardness increase is caused by work-hardening of the particles and then by the amorphization process which leads to a very high hardness, comparable to bulk amorphous alloys. At lower vanadium content the micro-hardness changes had the same character, i. e. with plateau at about 400 HV_(20) between 10 and 20 hours in contradiction to alloy Ti-60.4Al-20V, where the hardness increase was more up 900 HV_(20).
机译：在γ相区域内选择TiAl-V合金成分，最多可含20 at％的钒。在元素粉末的高能研磨过程中，研磨20小时后观察到Al（Ti，V）固溶体的形成。较长的铣削会导致大多数材料非晶化，并在最高钒含量的合金中形成亚稳相。粒度在研磨时间10小时后增加，然后降低。钒含量较高时，观察到获得最终球形和非晶结构所需的最短时间。研磨40小时的粉末的透射电子显微镜研究表明，粉末颗粒具有一定的化学非均质性。它与粉末的分层内部结构相连。研磨40小时后，粉末的平均维氏显微硬度范围从HV_（20）= 710到955至955（含10和15 at）的合金。 ％V。最初的硬度增加是由颗粒的加工硬化引起的，然后是由非晶态化过程引起的，非晶态化过程导致的硬度非常高，与块状非晶态合金相当。在较低的钒含量下，显微硬度变化具有相同的特性，即。 e。与Ti-60.4Al-20V合金相反，在10到20小时之间处于约400 HV_（20）的平稳期，后者的硬度增加更大，达900 HV_（20）。

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