90W-Ni-Mn合金的制备与性能研究  

Preparation and property investigation of 90W-Ni-Mn alloy

作　　者：李文超[1] 曹顺华[1] 张秀芳[1] 谢继峰[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2009年第5期347-350,共4页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金专项基金(50823006)

摘　　要：采用液相烧结工艺制备90W-Ni-Mn合金,研究锰含量对合金相对密度和抗拉强度的影响,并通过扫描电镜(SEM)观察试样断口形貌,利用金相显微镜观察样品显微组织。结果表明,随着锰含量增加,合金的相对密度和抗拉强度均降低,在1280℃保温2h得到的90W-8Ni-2Mn合金相对密度达97.32%,抗拉强度为702.50MPa;合金的整体密度和抗拉强度较低,主要是由于锰的化学活性很高,烧结过程中在相界面上易生成Mn的氧化物中间相,导致合金的孔隙度较大,从而降低合金的密度和抗拉强度。The effect of Mn content on relative density and tensile strength of 90W-Ni-Mn alloy prepared by liquid phase sintering has been studied. Fracture morphology and microscopic structure are investigated by SEM and metallographic microscope, respectively. The relative density and tensile strength of 90W-Ni-Mn have also been explored. The results show the relative density and tensile strength decrease with increasing Mn content. The relative density of 90W-8Ni-2Mn alloy sintered at 1 280 ℃ for 2 h is 97.32% and the tensile strength is 702.50 MPa. Middle phase of Mn oxide forms at phases interface, resulting in the porosity increase and relative density/tensile strength decrease.

关 键 词：90W-Ni-Mn合金 MN 液相烧结 拉伸强度 

分 类 号：TF125.241[冶金工程—粉末冶金]