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OALib Journal期刊
ISSN: 2333-9721
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粉末冶金ti2alnb合金的制备及持久寿命*
Keywords: 金属材料,粉末冶金,ti2alnb合金,持久寿命,近净成型
Abstract:
？采用无坩埚感应熔炼超声气体雾化法制备了成分为ti-22al-24nb-0.5mo(原子分数,%)的预合金粉末,通过包套热等静压工艺制备了粉末ti2alnb合金。研究结果显示热等静压温度显著影响粉末ti2alnb合金的冶金质量,需严格控制。对制备的粉末合金进行了热处理,分析了热处理制度对粉末ti2alnb合金相组成、显微组织、拉伸及高温持久寿命的影响,优选了粉末ti2alnb合金的热处理工艺。粉末ti2alnb合金高温持久寿命受多方面因素协同影响;时效温度较低时(800-850℃),随着时效温度的升高,次生o相板条宽度和长度增加、α2相体积分数减少,协同作用的结果是持久寿命增加;时效温度较高(850-900℃)时,次生o相尺寸、α2相体积分数变化不显著,b2相体积分数增加及α2相尺寸的增大对持久寿命的提高起了关键作用。
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