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通过单辊快淬制备了Al85Ni9-xMxLa6和Al86Ni9-xMxLa5(M=Cu或Co,x=0～9)合金的薄带,利用X射线衍射仪(XRD)研究了薄带快淬态和退火态的结构,利用差示扫描量热仪(DSC)研究了上述合金薄带的晶化过程。结果表明,过量Cu,Co置换Ni降低合金的非晶形成能力,形成非晶相和晶态相的混合结构;Cu,Co置换Ni分别促进fcc-Al和亚稳相作为初生相析出:Al85Ni9-xCuxLa6合金的初生相由单独亚稳相MP1逐渐向单独fcc-Al转变,而Al86Ni9-xCoxLa5合金的初生相由单独fcc-Al逐渐向fcc-Al、亚稳bcc-(AlNi)11La3-like相和MP1转变,并趋于析出单独MP1;Cu,Co置换Ni分别降低和提高热稳定性:Al85Ni9-xCuxLa6和Al86Ni9-xCuxLa5合金的晶化开始温度Tx1分别从x=0时的545.5和520.3 K逐渐减至x=8时的415.0 K和x=7时的390.1 K,而Al85Ni9-xCoxLa6和Al86Ni9-xCoxLa5合金的Tx1分别逐渐增至x=6时的592.2 K和x=9时的576.8 K;Cu,Co置换Ni分别减弱和增强玻璃转变:Al85Ni9-xCuxLa6合金的玻璃转变迅速减弱,过冷液相区宽度ΔTx从x=0时的16.5 K逐渐减至x=2时的14.6 K,并于x>2时完全消失,Al86Ni9-xCuxLa5合金即使当x=1时玻璃转变也随之消失,而Al85Ni9-xCoxLa6和Al86Ni9-xCoxLa5合金的ΔTx分别从x=0时的16.5和15.4 K逐渐增至x=6时的26.0 K和x=5时的19.9 K。
The ribbons of Al85Ni9-xMxLa6 and Al86Ni9-xMxLa5 (M = Cu or Co, x = 0-9) alloys were prepared by single-roll quenching. The quenched and annealed ribbons were investigated by X-ray diffraction The structure of the alloy ribbon was studied by differential scanning calorimetry (DSC). The results showed that the substitution of excess Cu and Co for Ni decreased the amorphous formation ability and formed a mixed structure of amorphous phase and crystalline phase. The substitution of Cu and Co for Ni promoted the precipitation of fcc-Al and metastable phases as the primary phase, respectively: Al85Ni9- The primary phase of xCuxLa6 alloy transforms from single metastable phase MP1 to single fcc-Al phase, while the primary phase of Al86Ni9-xCoxLa5 alloy gradually changes from fcc-Al to fcc-Al and metastable bcc- (AlNi) 11La3- MP1 and tends to separate MP1; Cu, Co replacement Ni reduce and improve the thermal stability respectively: the crystallization start temperature Tx1 of Al85Ni9-xCuxLa6 and Al86Ni9-xCuxLa5 alloys gradually decreases from 545.5 and 520.3 K at x = 0 415.1 K at x = 8 and 390.1 K at x = 7, while Tx1 of Al85Ni9-xCoxLa6 and Al86Ni9-xCoxLa5 alloys gradually increased to 592.2 K at x = 6 and 576.8 K at x = 9, respectively; Co substitution Ni weakens and enhances the glass transition respectively: the glass transition of Al85Ni9-xCuxLa6 alloy decreases rapidly, the width ΔTx of the supercooled liquid phase decreases from 16.5 K at x = 0 to 14.6 K at x = 2, 2 completely disappeared, Al86Ni9-xCuxLa5 alloy even when x = 1 glass transition also disappeared, while the ΔTx of Al85Ni9-xCoxLa6 and Al86Ni9-xCoxLa5 alloy from x 16.5 and 15.4 K at = 0 gradually increase to 26.0 K at x = 6 and 19.9 K at x = 5.