Enhancing the glass-forming ability of Ni-Co-Ta-W-B metallic glass alloy to increase its potential use in metal matrix composite production

Abstract

In this study, the glass-forming ability of the B-rich Ni-Co-W-B metallic glass alloy family has been enhanced through the addition of Fe and Cr. This alloy family represents a promising group of materials that can serve as precursors for producing metal matrix composite (MMC) materials with high toughness and hardness. As a result of the crystallization of the alloy family, a Ni solid solution that can provide high toughness and a boride phase (CoWB) with very high hardness is formed. The glass-forming ability, thermal properties, and microhardness characteristics of the Ni31.56Co21.74B15W23.7Ta8 alloy, one of the bulk metallic glasses with a high crystallization temperature, were investigated by adding Fe and Cr elements. The structural and thermal properties of the alloys were investigated using X-ray diffraction (XRD), differential scanning calorimetry (DSC), Vickers microhardness, and scanning electron microscopy (SEM) analyses. The analyses revealed that the addition of Cr increases crystallization in the alloy, thereby negatively impacting its glass-forming ability. In contrast, it was determined that incorporating Fe at certain levels can enhance the glass-forming ability of the alloy. The Ni21.5Co21.5Fe10.3B15W23.7Ta8 alloy exhibited a critical casting thickness of 1 mm, with a crystallization temperature (Tx) measured at 747°C. Micro-hardness measurements revealed that the hardness of the alloy is 1253 HV. It has been demonstrated that adding Fe in appropriate amounts can enhance the glass-forming ability, whereas the addition of Cr adversely affects the glass-forming tendency.

Keywords

• glass-forming ability
• Co-W-B phase
• Bulk metallic glass
• Microhardness
• Thermal properties

Ni-Co-Ta-W-B metalik cam alaşımının metal matrisli kompozit üretiminde kullanım potansiyelinin arttırılması için camlaşma kabiliyetinin geliştirilmesi

Abstract

Bu çalışmada, B açısından zengin Ni-Co-W-B metalik cam alaşımı ailesinin cam oluşturma yeteneği Fe ve Cr ilavesiyle arttırılmıştır. Bu alaşım ailesi, yüksek tokluk ve sertliğe sahip metal matrisli kompozit (MMC) malzemelerin üretiminde öncü olarak hizmet edebilecek umut verici bir malzeme grubunu temsil etmektedir. Alaşım ailesinin kristalleşmesi sonucunda yüksek tokluk sağlayabilen bir Ni katı çözeltisi ve çok yüksek sertliğe sahip bir borür fazı (CoWB) oluşmaktadır. Yüksek kristalleşme sıcaklığına sahip dökme metalik camlardan biri olan Ni31,56Co21,74B15W23,7Ta8 alaşımının cam oluşturma yeteneği, termal özellikleri ve mikrosertlik özellikleri Fe ve Cr elementleri eklenerek incelenmiştir. Alaşımların yapısal ve termal özellikleri X-ışını kırınımı (XRD), diferansiyel taramalı kalorimetri (DSC), Vickers mikrosertliği ve taramalı elektron mikroskobu (SEM) analizleri kullanılarak araştırılmıştır. Analizler, Cr ilavesinin alaşımdaki kristalleşmeyi arttırdığını, dolayısıyla cam oluşturma yeteneğini olumsuz yönde etkilediğini ortaya çıkarmıştır. Buna karşılık, Fe'nin belirli seviyelerde eklenmesinin alaşımın cam oluşturma yeteneğini artırabileceği belirlenmiştir. Ni21,5Co21,5Fe10,3B15W23,7Ta8 alaşımı, 747°C'de ölçülen kristalizasyon sıcaklığı (Tx) ile 1 mm'lik kritik döküm kalınlığı sergilemiştir. Mikro sertlik ölçümleri alaşımın sertliğinin 1253 HV olduğunu ortaya çıkarmıştır. Uygun miktarlarda Fe eklenmesinin cam oluşturma yeteneğini artırabileceği, Cr eklenmesinin ise cam oluşturma eğilimini olumsuz yönde etkilediği gösterilmiştir.

Keywords

• Cam oluşturma kabiliyeti
• Co-W-B fazı
• İri hacimli metalik cam
• mikrosertlik
• termal özellikler

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