非晶合金热塑性成形过程中的氧化  

Oxidation behavior of bulk metallic glass during thermoplastic forming

作　　者：张茂[1] 邓磊[1] 金俊松[1] 龚攀[1] 王新云[1] ZHANG Mao;DENG Lei;JIN Junsong;GONG Pan;WANG Xinyun(State Key Laboratory of Materials Processing and Die ＆ Mould Technology,Huazhong University of Science and Technology,Wuhan 43（1074,China)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《自然杂志》2018年第3期157-168,共12页Chinese Journal of Nature

基　　金：国家自然科学基金项目(51725504;51675200;51601063;51705168)资助

摘　　要：非晶合金由于具有高强度、耐腐蚀、抗磨损以及热态下良好的超塑性成形能力等优势,在工程技术领域具有广阔的应用前景。非晶合金热塑性成形工艺充分利用非晶合金在热态下的超塑性成形能力,是加工制造非晶合金零件的重要途径,但是非晶合金在热态下的氧化会显著影响非晶合金热塑性成形工艺的产品质量和生产成本。针对非晶合金在过冷液相区的氧化行为开展的研究发现:非晶合金的晶化会导致其氧化机制的转变;随着氧化程度的增加,氧化层内会形成多个亚层结构;粗糙表面能够显著促进非晶合金的氧化;在一定程度上,压应力能够抑制非晶合金氧化,而拉应力则能促进其氧化;氧化能够提高非晶合金的表面硬度,并改善其耐腐蚀能力。Since bulk metallic glass（BMG） has advantages including high strength, strong resistance to corrosion and abrasion, and favorable super-plastic formability at elevated temperatures, it has a wide application prospect in the field of engineering technology. The thermoplastic forming（TPF） process takes full advantages of the superplasticity of BMG and is an important approach to manufacture BMG parts. However, the oxidation of BMG at elevated temperatures obviously affects the product quality and production cost of TPF. Hence, the oxidation of BMG in its supercooled liquid region is studied in this paper. The results revealed that： the crystallization of BMG would lead to the change of oxidation mechanism; with the increase of oxidation degree, multiple sub-layer structures would occur inside the oxide scale; surface roughening would lead to the obvious acceleration of oxidation rate; the oxidation process was hindered under compressive loading while promoted under tensile loading; the oxidation can increase the surface hardness of BMG and improve its corrosion resistance to some extent.

关 键 词：非晶合金 热塑性成形 氧化 过冷液相区 

分 类 号：TG139.8[一般工业技术—材料科学与工程]