摘要
高熵合金是國內研發團隊所開發出的新型材料，本文針對五種不同成分高熵合金進行車削實驗，分析各合金的被切削性與合金成分差異對材料性質的影響。 實驗結果發現Fe1Co1Ni1Cr1Cu0.2Al1 合金材質硬脆，在低切速時添加切削液可降低刀腹磨耗，但在較高切速條件下容易產生刀具刃口斷裂破壞。車削合金Fe1.5Ni0.5Cr1Al0.3Mn1 時切削力高且波動大，易造成刀具刃口破裂，車削時的材料移除為脆性破壞機制，會形成加工後表面裂紋生成的不良結果。其餘三種材料比較切削結果， 合金Fe1Co1Ni1Cr1Cu0.2Al0.5、Fe1Co1Ni1Cr1Cu1Al0.5與Fe1.5Co1Ni0.5Cr1Al0.3Mn1三種材料延性佳，車削加工容易，但合金2切削力較高，刀腹磨耗最大，合金4在90m/min切速時刀腹磨耗極大，會使加工後表面粗度變差。 分析成分差異發現合金Fe1Co1Ni1Cr1Cu0.2Alx,x=0.5,1之鋁含量增加可強化硬度，但由於鋁含量比例為1莫耳時材料韌性不佳，應降低比例為0.8~0.9莫耳以提升耐衝擊能力與切削性。當Fe1Co1Ni1Cr1Cuy-Al,y=0.2,1合金的銅元素含量增加，合金硬度僅有些微升高，但可降低切削阻力與刀具磨耗，有助於提升材料切削性。合金Fe1.5CozNi0.5Cr1Al0.3Mn1,z=0,1中的鈷元素有助於改善材料韌性，但鈷元素比例為1莫耳時材料太軟，未添加鈷的合金硬度高但韌性極差，可調整含量莫耳數為0.1~0.3，配合材料時效熱處理，獲得兼具硬度與韌性的適宜材料配方比例。
並列摘要
This study presents an experimental investigation of the machinability of five kinds of High-Entropy Alloys and the effects of Al, Cu, Co elements inclusion on material properties in turning of High-Entropy Alloys. When the Fe1Co1Ni1Cr1Cu0.2Al1 alloy is put under turning with cutting fluid at lower speed (<32m/min), the tool flank wear is reduced. If the cutting speed increased, breakage and chipping would appear on tool nose. Cutting force is large when turning Fe1.5Ni0.5Cr1Al0.3Mn1 alloy. It is found the material of workpiece is removed mainly by brittle fracture, and hence the surface roughness is poor. The hardness of other three kinds of alloys are much smaller. A great tool flank wear was found when turning Fe1Co1Ni1Cr1Cu0.2Al0.5 and Fe1.5Co1Ni0.5Cr1Al0.3Mn1 at higher cutting speed (90m/min), and as a result leads to unsatisfactory surface roughness. In alloy Fe1Co1Ni1Cr1Cu0.2Alx, x=0.5,1, y=0.2,1 the x could be set around 0.8~0.9 in order to increase the machinability and the y could be set to 1 or higher to reduce the cutting force and tool wear in turning this material. In alloy Fe1.5CozNi0.5Cr1Al0.3Mn1,z=0,1, the z could be set around 0.1~0.3 to improve its ductility.