鋁含量對(Zr0.761Cu0.147Ni0.092)93-xAl7+x 非晶合金的熱穩(wěn)定性及其力學(xué)性能的影響

鋁含量對(Zr0.761Cu0.147Ni0.092)93-xAl7+x 非晶合金的熱穩(wěn)定性及其力學(xué)性能的影響Effects of Al content on thermal stability and mechanical properties of (Zr0.761Cu0.147Ni0.092)93-xAl7+x amorphous alloy

采用銅模吸鑄法制備(Zr0.761Cu0.147Ni0.092)93-xAl7+x(x=0, 1, 2, 3, 5, 7 (摩爾分?jǐn)?shù), %))塊體非晶合金，采用同步示差掃描量熱儀(DSC)、萬能試驗(yàn)機(jī)和顯微硬度計(jì)測試各試樣的過冷液相區(qū)、壓縮塑性和顯微硬度，利用X射線衍射(XRD)和掃描電鏡(SEM)等手段對其微觀結(jié)構(gòu)和力學(xué)性能的關(guān)系進(jìn)行分析。結(jié)果表明：隨著Al含量的增加，(Zr0.761Cu0.147Ni0.092)93-xAl7+x非晶合金的玻璃轉(zhuǎn)變溫度Tg、初始晶化溫度Tx均呈現(xiàn)增大的趨勢，而過冷液相區(qū)ΔTx先增大后減小，在x=3時(shí)達(dá)到最大的94 K。合金塑性變形εp隨著Al含量的增加先增大后減小，在x=3時(shí)達(dá)到最大值為15.82%；合金屈服強(qiáng)度σs和顯微硬度HV都呈現(xiàn)增強(qiáng)的趨勢，在x=7時(shí)取得最大值，分別為1713和4095 MPa。

(Zr0.761Cu0.147Ni0.092)93-xAl7+x bulk amorphous alloys with x of 0, 1, 2, 3, 5, 7 (mole fraction, %) were prepared by copper mold casting method. The differential scanning calorimeter (DSC), universal testing machine and micro-hardness tester were employed to detect the supercooled liquid region, mechanical properties and microhardness of the samples, respectively. Furthermore, the relationship between microstructures and mechanical properties of the BMGs was analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that, with the addition of the content of Al, the glass transition temperature Tg and initial crystallization temperature Tx of (Zr0.761Cu0.147Ni0.092)93-xAl7+x (x=0, 1, 2, 3, 5, 7 (mole fraction, %)) amorphous alloys increase. But the supercooled liquid region ΔTx of amorphous alloys firstly increases and then decreases, and it reaches 94 K which is best in the supercooled liquid region ΔTx of the alloys when x=3. The plastic deformation increases first and then decreases with the Al content increasing and the plastic deformation reaches the highest value of 15.82% while x is 3. Along with the increase of the content of Al, the yield strength σs and microhardness HV of the alloy have an enhanced trend, and both of them reach the highest value of 1713 and 4095 MPa while x is 7.

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