易形成非晶态的镁基合金Mg－Ni－Nd研究

Mg-Based Mg-Ni-Nd Alloys with Easily Formed Amorphousness

将几种Ｎｉ，Ｎｄ含量高达２０ａｔ％和１５ａｔ％的Ｍｇ基合金直接铸入楔型金属模，然后采用熔体急冷法快速凝固制成厚度为３０～１００μｍ的条带，Ｘ射线衍射和差分扫描量热计（ＤＳＣ）的分析结果证明在楔型模及条带中上述镁基合金确实以非晶态存在，实验测定这些非晶条带的抗拉强度和显微硬度分别为３３０～６３０ＭＰａ和１９０～２５０ｋｇ／ｍｍ￣２，远远大于常规铸态镁基合金，并对其应用前景和这类镁基合金的非晶态形成能力进行了分析。

A number of Mg-based alloys containing up to 20 at%Ni and 15 at%Nd were cast di-rectly into a wedge-shaped mould and subsequently rapidly-solidified by chill-block melt-spinning to produce ribbons between 30～100 μm in thickness. The existence of amorphous-ness in the wedge and ribbons was confirmed by X-ray diffraction and DSC. The tensilestrength and microhardness of the ribbons measured are in the range of 330～630 MPa and190～250 kg/mm￣2, respectively,which are significantly higher than those of conventionallycast Mg alloys. The potential application and the amorphousness forming ability of these al-loys are discussed.