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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Bulk amorphous and nanocrystalline A183Fe1 7 alloys prepared by consolidationof mechanically alloyed amorphous powder
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Bulk amorphous and nanocrystalline A183Fe1 7 alloys prepared by consolidationof mechanically alloyed amorphous powder

机译：通过机械合金化的非晶态粉末的固结制备块状非晶态和纳米晶A183Fe1 7合金

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摘要

In the present work, bulk amorphous and nanocrystalline A183Fe17 alloys were obtained by consolida-tion of mechanically alloyed powders. Mechanical alloying of Al-17% Fe powder mixture yielded powderwith an amorphous structure. Thermal behaviour of the milling product was examined using differentialscanning calorimetry. This investigation revealed that the amorphous phase crystallised above 380 °C.The amorphous powder was compacted under a pressure of 7.7 GPa in different conditions: at 380 °C for600 s and at 1000 °C for 180 s. Structural investigations of the bulk material revealed that the amorphousstructure was retained after consolidation process applied at 380 °C. Compaction under high pressureat 1000 °C caused crystallisation of the amorphous phase and appearance of metastable nanocrystallinephases, different to those which crystallised during heating in the calorimeter under atmospheric pres-sure. The microhardness of the bulk amorphous sample is 760 HVO.2, whereas that of bulk nanocrystallineone is 630 HVO.2. The density of the bulk amorphous material is 3.505 g/cm~3 and is -3% lower than thatof the nanocrystalline one. The open porosity of both consolidated materials is 0.4%. The results obtainedshow that the quality of compaction preserving amorphous structure as well as of the one yieldingnanocrystalline structure is satisfactory and the products' microhardness is relatively high. The resultsalso indicate that application of high pressure affects crystallisation of amorphous alloy influencing thephase composition of the products of this process.
机译：在本工作中，通过固溶机械合金化粉末获得了非晶态和纳米晶态的A183Fe17合金。机械合金化Al-17％Fe粉末混合物可得到具有无定形结构的粉末。使用差示扫描量热法检查研磨产物的热行为。研究表明，非晶相在380°C以上结晶。在7.7 GPa压力下，在380°C下600 s和1000°C下180 s的不同条件下压实了非晶相粉末。对散装材料的结构研究表明，在380°C进行固结处理后，非晶结构得以保留。与在大气压力下在量热仪中加热时所结晶的相不同，在1000°C的高压下压实会导致非晶相的结晶和亚稳态纳米晶相的出现。整体非晶态样品的显微硬度为760 HVO.2，而整体纳米晶酮的显微硬度为630 HVO.2。块状非晶材料的密度为3.505 g / cm〜3，比纳米晶材料的密度低-3％。两种固结材料的开孔率均为0.4％。所得结果表明，保压性保持非晶态结构和一种屈服的纳米晶结构的质量令人满意，产品的显微硬度较高。结果还表明，施加高压会影响非晶态合金的结晶，从而影响该工艺产品的相组成。

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