Fabrication of Nano-MgO Reinforced Fe-Cr.Ni Composites by Reactive Hot Pressing
The self-propagating combustion reaction 0.741Mg+0.247Fe2O3+0.188Ni+0.318Cr→ 0.741MgO+Fe0.94Ni0.188Cr0318 was applied to prepare a nano-MgO reinforced Fe-Cr-Ni composite,by reactive hot pressing (RHP) under a condition of 700℃/30MPa/2h. The densification was enabled by the low temperatures produced by the exothermic reaction. According to TG-DTA and X-ray diffractometry (XRD), the highly-exothermic thermite reaction began at about 600℃ and the in-situ formation of composites comprised predominantly of (FCC) Cr0.19Fe0.7Ni0.11, (FCC) Fe-Cr, (BCC) MgO and a small quantity of (BCC) MgFe204. The Vickers hardness was 3.67GPa, the three-point bending strength was 112.5+10MPa, and the fracture toughness was 3.28 MPa.m1/2. The microstmcture of the composite was observed via scanning electron microscopy. This indicated that the distributions of in-situ-formed (BCC) MgO phases (～800 nanometers) were homogeneous into in a matrix of a fine-grained metallic alloy phases that gather together to form agglomerates in thecomposite.
heat-resistant metal nano-MgO reactive hot pressing microstructure mechanicalproperties
Chang Chena Jian-Feng Yang Ji-Qiang Gao Cong-Yang Chu
State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian 710049,Peoples Republic of China
国际会议
10th International Symposium on Eco-Materials Processing and Design(第10届国际生态材料加工与设计研讨会)
西安
英文
551-554
2009-01-13（万方平台首次上网日期，不代表论文的发表时间）