Effect of additional elements on glass transition behavior and glass formation tendency of Zr-Al-Cu-Ni alloys
Effect of additional elements on glass transition behavior and glass formation tendency of Zr-Al-Cu-Ni alloys
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DOI：
10.2320/matertrans1989.36.1420
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
A. Inoue;T. Shibata;Tao Zhang
中科院分区：
文献类型：
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作者：
A. Inoue;T. Shibata;Tao Zhang
研究了添加M的Zr 65 Al 10 Cu 15 Ni 10基非晶合金的玻璃转变温度（Tg）和晶化温度（Tx）（M=Ti、Hf、V、Nb、Cr、Mo、Fe、Co、Pd或Ag）元素作为M元素的函数进行检测，目的是寻找Δ Tx（= Tx-Tg）增加的有效因素，并证实以前的经验规则对于大Δ Tx出现的适当性。随着除Hf外M元素添加量的增加，Tg逐渐增大，而Tx显著减小，并导致Δ Tx减小。没有发现导致Δ Tx增加的有效M元素，这是由于Cu-M（M=V，Nb，Cr，Mo，Fe，Co，Pd或Ag）和Zr-M（M=Ti或Hf）对部分产生了不满足经验规则的排斥键。在最大厚度约为8 mm的电弧熔炼铸锭中，非晶区面积比从Zr-Al-Cu-Ni合金的67%增加到含5%Ti、2.5%Nb或5%Pd的Zr基合金的90%左右，但Δ Tx因这些元素的加入而显著降低。这三种元素对电弧熔炼合金锭中玻璃形成倾向的显著影响是由于抑制了电弧熔炼合金中预先存在的晶核的生长反应。此外，用Δ Tx和非晶区面积比表征非晶形成倾向的差异，被认为是由于熔体快淬非晶合金Δ Tx的结晶形核和生长反应与电弧熔炼锭中非晶区面积比的生长反应的主导因素不同所致。无论Δ Tx的大小如何，导致电弧熔化合金的玻璃形成倾向增加的附加元素的发现似乎是块体玻璃合金未来发展的一个非常令人鼓舞的事件。
The glass transition temperature (T g ) and crystallization temperature (T x ) of the Zr 65 Al 10 Cu 15 Ni 10 base glassy alloys containing additional M (M=Ti, Hf, V, Nb, Cr, Mo, Fe, Co, Pd or Ag) elements were examined as a function of M elements, with the aim of finding an effective element for the increase in ΔT x ( = T x - T g ) and of confirming the appropriateness of the previous empirical rules for the appearance of large ΔT x . As the additional amount of the M elements except Hf increases, T g increases gradually, whereas T x decreases significantly and leads to the decrease in ΔT x . No effective M element leading to the increase in ΔT x is found. The ineffectiveness is attributed to the partial generation of repulsive bonding nature of Cu-M (M=V, Nb, Cr, Mo, Fe, Co, Pd or Ag) and Zr-M (M=Ti of Hf) pairs which does not satisfy the empirical rules. The area ratio of the glassy region in the arc-melted ingots with a maximum thickness of about 8 mm was found to increase from 67% for the Zr-Al-Cu-Ni alloy to about 90% for the Zr-based alloys containing 5%Ti, 2.5%Nb or 5%Pd, though ΔT x decreases significantly by the addition of these elements. The great effectiveness of the three elements on the glass-formation tendency in the arc-melted ingots is interpreted to originate from the suppression of the growth reaction of crystalline nulcei which pre-exist in the arc-melted alloy. Furthermore, the disagreement between the glass-formation tendency evaluated by ΔT x and the area ratio of the glassy region is thought to result from the difference in the dominant factors which are the crystalline nucleation and growth reactions for the ΔT x of the melt-spun glassy alloys and the growth reaction for the area ratio of the glassy region in the arc-melted ingot. The finding of the additional elements leading to the increase in the glass-formation tendency of the arc-melted alloys, regardless of the magnitude of ΔT x , seems to be a very encouraging event for future development of bulk glassy alloys.