Abstract
The effects of the α-Fe phase on mechanical properties and cracking of laser 3D printing Fe-based bulk metallic glass composites were investigated. The elastic recovery and plasticity index were characterized by nanoindentation. As the volume fraction of the α-Fe phase increases from 23.66% to 52.38%, the elastic modulus of printed samples suddenly drops. The samples exhibit a lower deformation resistance, and the plasticity index increases gradually. When the volume fraction of the α-Fe phase is 67.84%, the interaction between the α-Fe phase and matrix phase is smaller during expansion shrinkage. As a result, cracking is easy to initiate, which leads to the highest crack rate of the printed sample. However, as the volume fraction of the α-Fe phase increases to 83.31%, the hard brittle phase was sandwiched between the α-Fe phases similar to the finger structure plays key role in the plastic deformation. The plastic deformation releases large amounts of stress concentrated at the boundary and suppresses crack formation.
Highlights
Fe-based bulk metallic glasses (BMGs) are generally known for their high mechanical strength, excellent corrosion resistance, and wear resistance [1,2,3,4]
The methods of in situ second ductile phase [7,8] and introducing second phase [9,10,11,12] are usually used to improve the plasticity of bulk metallic glass composites
There are still some problems that hinder its application in the manufacture of BMGs
Summary
Fe-based bulk metallic glasses (BMGs) are generally known for their high mechanical strength, excellent corrosion resistance, and wear resistance [1,2,3,4]. The ambient-temperature brittleness and poor processability strictly limit the scope of their applications [5,6]. To circumvent these limitations, the methods of in situ second ductile phase [7,8] and introducing second phase [9,10,11,12] are usually used to improve the plasticity of bulk metallic glass composites. To alleviate the cracking problem, Lu et al employed a triple laser scanning strategy in the laser cladding Fe-based BMG process [16]. The results showed that the crystallinity of triple laser scanned samples was higher than that of the single laser scanned samples; crack-free samples were obtained.
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