【摘要】：采用銅模吸鑄法在不同過熱度下制備了Cu_(40)Zr_(44)Al_8Ag_8大塊非晶合金(BMGs),分別采用同步示差掃描量熱儀(DSC)和單軸壓縮實(shí)驗(yàn)測(cè)試了各試樣的玻璃形成能力(GFA)和力學(xué)性能,并利用X射線衍射(XRD)儀、掃描電子顯微鏡(SEM)和透射電子顯微鏡(TEM)等手段對(duì)其顯微結(jié)構(gòu)與GFA和力學(xué)性能的關(guān)系進(jìn)行分析。結(jié)果發(fā)現(xiàn):所有試樣非晶基體中均夾雜有少量晶體相,且隨著過熱度的提高,試樣的GFA不斷提高;非晶合金中晶粒變小,晶化體積分?jǐn)?shù)不斷減小,強(qiáng)度和塑性逐漸增大,并在吸鑄功率為6 kW時(shí)達(dá)到最優(yōu)值,繼續(xù)增加過熱度,力學(xué)性能反而迅速下降。
[Abstract]:Cu_ _ (40) Zr_ _ (44) Al_8Ag_8 bulk amorphous alloy (BMGs), was prepared by copper mould suction casting under different superheat. The glass forming ability (GFA) and mechanical properties of each sample were tested by synchronous differential scanning calorimeter (DSC) and uniaxial compression test, respectively. The glass forming ability and mechanical properties of each sample were tested by X-ray diffraction (XRD). The relationship between microstructure, GFA and mechanical properties was analyzed by means of scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that there is a small amount of crystal phase in the amorphous matrix of all the samples, and the GFA of the sample increases with the increase of superheat, and the grain size becomes smaller, the crystallization volume fraction decreases, the strength and plasticity increase gradually in the amorphous alloy. When the suction power is 6 kW and the superheat is increased, the mechanical properties decrease rapidly.
【作者單位】： 蘭州理工大學(xué)甘肅省有色金屬新材料國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(50961008和51061008) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(“973”計(jì)劃) 前期研究專項(xiàng)資助項(xiàng)目(2011CB612203)
【分類號(hào)】：TG139.8

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