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测定了用转鼓法制备的Pd_(82·5)M_1Si_(18·5)非晶态合金的应力松弛和延脆转变特性.发现前过渡金属Hf,Ta,W,Re显著提高该非晶态合金的延脆转变温度T_B和延脆转变激活能△E_B,后过渡金属中的Os,Pt对其影响较小,而Ir则使T_B下降较多.添加前、后两类不同的过渡金属PdSi_(16■)非晶态合金的延脆转变方式也有所不同.比较了添加元素对延脆转变温度T_B、玻璃转变温度T_g、延脆转变激活能△E_B以及玻璃转变激活能△E_g的影响.用Gaskell模型和Engel-Brewer过渡金属电子理论解释了前、后过渡金属对PdSi_(16·5),非晶态合金延脆转变的不同影响.

The stress relief and ductile-brittle transformation of the metallic glasses Pd_(82.5)M_1Si_(16.5)prepared by spinning roll have been examined.It was found that theductile-brittle transformation temperature,T_B,and activation energy,△E_B,of theglasses composed by the preceding transition metals,e.g.,Hf,Ta,W,Re,are in-creased markedly and by the later ones,e.g.,Os,Pt,influenced slightly,but byIr,T_B is decreased too many.The mode of ductile-brittle transformation of themetallic glasses PdSi_(16.5)is different among themselves composed by the precedingand later transition metals.The comparison of the influences of additives on theirtemperatures and activation energies of the ductile-brittle transformation and glasstransition has been made.These behaviours have been discussed on the basis ofthe Gaskell′s model and the Engel-Brewer′s electron theory of transition metals.