(1. 萊蕪鋼鐵集團(tuán)粉末冶金有限公司，萊蕪 271105；
2. 中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 將元素Ni、Fe和Al粉以摩爾比56.5׃18.5׃25配料，分別按元素粉末高能球磨(300 r/min, 12 h)、元素粉末直接干混、50%元素粉+50%預(yù)合金粉末干混3種方式混料；混料在500 MPa的壓力下壓制成形，1 280 ℃下燒結(jié)；對合金燒結(jié)態(tài)進(jìn)行相對密度測定、力學(xué)性能檢測、X射線衍射分析(XRD)和斷口形貌觀察。結(jié)果表明：50%元素粉+50%預(yù)合金粉制備的合金性能最好，密度可達(dá)到6.61 g/cm3(相對密度94.8%)，燒結(jié)態(tài)抗拉強(qiáng)度可達(dá)到868 MPa，說明元素粉末中添加的預(yù)合金粉可以控制燒結(jié)過程，提高合金的燒結(jié)密度，同時(shí)增強(qiáng)合金的力學(xué)性能。
關(guān)鍵字: Ni-Fe-Al合金；機(jī)械合金化；粉末冶金
powder metallurgy NiFe18.5Al25 alloy
（1. Laiwu Iron & Steel Group Powder Metallurgy Co. Ltd., Laiwu 271105, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Ni-Fe-Al alloys were made by powder metallurgy from mixing the elementary powder Ni, Fe and Al with the mole ratio of 56.5׃18.5׃25 by three different methods, i.e. balling mill elementary powder Ni, Fe, Al (300 r/min, 12 h); mixing elementary powder Ni, Fe, Al; mixing 50% elementary powder and 50% prealloyed powder. The alloys were sintered at 1 280 ℃ for 2 h after shaping them under 500 MPa. The sintered NiFe18.5Al25 alloys were studied by density test, tensile strength measurement, X-ray diffractometry (XRD) and fracture observation. The results show that the alloy fabricated by 50% prealloyed powder and 50% elementary powder has the best property, the density is 6.61 g/cm3 (relative density is 94.8%) and the tensile strength of sintered alloy is 868 MPa, which indicates that the prealloyed powder added into the elementary powder can control the sintering process, improve the alloy’s sintered density, and enhance the mechanical properties of the alloy.
Key words: Ni-Fe-Al alloy; mechanical alloy; powder metallurgy
