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首页> 外文期刊>Journal of Materials Science >Nano-structured intermetallic compound TiAl obtained by crystallization of mechanically alloyed amorphous TiAl, and its subsequent grain growth
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Nano-structured intermetallic compound TiAl obtained by crystallization of mechanically alloyed amorphous TiAl, and its subsequent grain growth

机译：通过机械合金化的非晶态TiAl结晶获得的纳米结构金属间化合物TiAl及其随后的晶粒生长

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摘要

The amorphization process during mechanical alloying (MA) was investigated for the Al-50at%Ti and Al-50at%Ti-10vol%TiB_(2) powder mixtures. Pure metallic powders of Al and Ti were finely mixed and transformed to the amorphous phase after being milled for about 2880 ks. In the case of Al-50at%Ti-10vol%TiB_(2) powder, the amorphous alloys with a fine dispersion of TiB_(2) particles could be obtained for a shorter milling times than that required for the powders without TiB_(2) ceramics. As a result of heat treatment for the mechanically alloyed amorphous powders, a nanocrystalline intermetallic compound of TiAl (γ) could be produced. Subsequent grain growth of the γ phase during heat treatment was investigated by estimating the grain-growth exponent and the activation energy for grain growth. It was found from this estimation that the grain growth was further suppressed as the powders were mechanically alloyed for longer times. Furthermore, the addition of the TiB_(2) particles that could be dispersed during MA finely and homogeneously in the amorphous matrix was found to be effective for suppression of the γ grain growth especially at elevated temperatures as well as for a long annealing.
机译：研究了Al-50at％Ti和Al-50at％Ti-10vol％TiB_（2）粉末混合物在机械合金化（MA）过程中的非晶化过程。在研磨约2880 ks后，将纯金属粉末Al和Ti精细混合并转变为非晶相。在Al-50at％Ti-10vol％TiB_（2）粉末的情况下，可以得到比TiB_（2）颗粒细分散的非晶态合金，其研磨时间要比不含TiB_（2）的粉末所需的研磨时间短。陶瓷。通过对机械合金化的非晶态粉末进行热处理的结果，可以生产TiAl（γ）的纳米晶金属间化合物。通过估计晶粒长大指数和晶粒长大的活化能，研究了热处理过程中γ相的随后晶粒长大。从该估计中发现，随着粉末被机械合金化更长的时间，晶粒的生长被进一步抑制。此外，发现可以在MA中精细且均匀地分散在非晶基质中的TiB_（2）颗粒的添加对于抑制γ晶粒的生长是有效的，尤其是在高温下以及长时间的退火中。

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