Preparation of Mg-Al-Ca Ribbons by Melt-spinning

Hua Min; Ma Liqun; Ding Yi; Zhang Zhenzhong

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Preparation of Mg-Al-Ca Ribbons by Melt-spinning
Issue 8, Pages: 619-622(2007)
Published： 2007 ，
DOI：

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[1]华旻,马立群,丁毅,张振忠.快速凝固法制备Mg-Al-Ca合金薄带[J].特种铸造及有色合金,2007(08):619-622+572.

Hua Min, Ma Liqun, Ding Yi, et al. Preparation of Mg-Al-Ca Ribbons by Melt-spinning. [J]. Special Casting & Nonferrous Alloys (8):619-622(2007)
[1]华旻,马立群,丁毅,张振忠.快速凝固法制备Mg-Al-Ca合金薄带[J].特种铸造及有色合金,2007(08):619-622+572. DOI：

Hua Min, Ma Liqun, Ding Yi, et al. Preparation of Mg-Al-Ca Ribbons by Melt-spinning. [J]. Special Casting & Nonferrous Alloys (8):619-622(2007) DOI：

摘要

通过单辊快淬法制备了Mg-8.2Al-4.7Ca合金薄带

采用XRF、XRD、金相显微分析、显微硬度测量等分析方法研究了其凝固组织及相结构

以及转速对镁合金条带厚度和显微硬度的影响。研究结果表明

急冷快速凝固条件下

合金形成非晶相+细小hcp-Mg（Al

Ca）相;镁合金薄带显微组织沿厚度方向分为近辊面细晶区、内部柱状晶和自由面粗晶区;随着辊速的提高

晶粒不断细化

薄带的硬度不断提高。晶粒细化是显微硬度提高的主要原因。

Abstract

The solidification structure and phase constituent of Mg-8.2Al-4.7Ca alloy ribbons prepared by melt-spinning have been observed by XRF

XRD

optical observation and micro-hardness measurements

meanwhile

the effects of rotating speed of the single-roller on the thickness and micro-hardness of the Mg alloy ribbons have been approached. The results indicate that the melt-spinning alloy ribbons are composed of amorphous phase and fine hcp-Mg（Al

Ca） phase

which is different from that of conventionally solidified alloy ribbons. It can be observed from the cross section of the ribbon that three distinct zones appears in the microstructure: fine equiaxed grain size close to the copper roller

columnar zone and coarse equiaxed grain zone close to the free surface. With the increase of rolling speed

the micro-hardness of the alloy ribbons can be increased

which is attributed to the refinement of the grain size.