SPS制备Al_2O_3-弥散强化铜合金及其显微组织  

Microstructure of Al_2O_3-dispersion strengthened copper prepared by SPS

作　　者：张雪辉[1] 林晨光[1] 崔舜[1] 李增德[1] 胡晓康[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《材料热处理学报》2013年第11期1-5,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助项目(5043202)

摘　　要：采用放电等离子烧结(SPS)技术制备了Al2O3-弥散强化铜合金,对SPS烧结过程及机理进行了探讨,并利用SEM、TEM、XRD等测试技术对合金显微组织及原位生成的Al2O3弥散相的相结构进行了观察分析,结果表明:SPS烧结过程主要是由烧结颈形成初期、烧结颈长大粗化期以及完全致密化时期3个阶段组成,不同阶段之间没有明确的分界线,各阶段其作用机制不同;烧结过程中共有3个放气峰存在,分别对应于水蒸气的脱除、低温氧的脱附和表层吸附气体去除、高温及外部压力情形下氧的脱附及合金内部气体的排除;合金中原位生成了大小为25 nm,间距为50 nm,呈均匀弥散分布的γ-Al2O3质点,钉扎位错和晶界,对基体产生弥散强化和抑制再结晶作用。A12 03 -dispersion strengthened copper （DSC） alloy was prepared by spark plasma sintering （SPS） process, meanwhile, the microstructure and A1203 dispersion phase of DSC alloy were also observed by scanning electron microscopy （SEM） , transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The results show that SPS process could be divided into three periods： sintering neck formation, sintering neck growing and densification, there is no distinct limits between the different stages. Besides, it is found that three deflation peaks exist in the process of SPS, corresponding to removal of steam, desorption of oxygen and elimination of inner gas; In situ nano-sized Y-A1203 particles generated in the copper matrix are fine and homogeneous, for which the size and particle spacing are 20 nm and 50 nm, respectively. These particles can pin up the dislocations and grain boundaries to strengthen the matrix and inhibit its recrystallization.

关 键 词：放电等离子烧结 弥散强化铜 显微组织 孪晶 

分 类 号：TG146.1[一般工业技术—材料科学与工程]