顯微組織及室溫力學性能
(湖南大學 材料科學與工程學院, 長沙 410082)
摘 要: 研究了多層噴射沉積SiCP/Al-8.5Fe-1.3V-1.7Si復合材料通過擠壓后再軋制以及模壓致密后再軋制的顯微組織特點及其室溫力學性能。通過金相顯微鏡、X射線衍射儀、掃描電鏡和透射電鏡觀察在加工過程中復合材料的顯微組織，分析顯微組織密度對室溫力學性能的影響。結(jié)果表明：通過擠壓后再軋制以及模壓后再軋制的SiCp/Al-8.5Fe-1.3V-1.7Si復合材料具有突出的室溫性能，其中通過擠壓后軋制板材的室溫抗拉強度(σb)達555 MPa，模壓后軋制得到的板材室溫抗拉強度(σb)達620 MPa；分析認為其突出的室溫性能主要得益于復合材料中的顆粒狀SiC的顆粒增強以及材料中彌散析出的Al13(Fe, V)3Si相、噴射沉積工藝得到基體材料的細小晶粒(約800 nm)、通過大量變形形成晶粒內(nèi)和晶界附近的位錯纏結(jié)以及噴射原始顆粒邊界氧化皮的破碎而產(chǎn)生的強化。
關(guān)鍵字: Al-8.5Fe-1.3V-1.7Si/SiC復合材料；多層噴射沉積；室溫力學性能；顯微組織
properties of SiCp/Al-8.5Fe-1.3V-1.7Si composite
（College of Materials Science and Engineering, Hunan University,
Changsha 410082, China）
Abstract:The microstructure and mechanical properties at ambient temperature of multi-layer spraying deposited SiCp/Al-8.5Fe-1.3V-1.7Si composite obtained by rolling after extruding or hot pressing were investigated. The microstructure and phase components of these composites during processing were observed by SEM, TEM and XRD, furthermore, the influence of density of microstructure to OM ambient temperature mechanical properties was analyzed. The results indicate that the tensile strength (σb) of SiCp/Al-8.5Fe-1.3V-1.7Si composite sheet obtained by rolling after extruding and extruding after hot pressing are 555 and 620 MPa, respectively. The reinforcement function of SiC particles, the phase Al13(Fe, V)3 Si deposited from refine grains (about 800 nm) in the matrix alloy obtained by multi-layer spraying deposition, the dislocation tangle at grain and the near area of grain boundary gained by deformation of oxide skins contribute to these remarkable ambient temperature properties.
Key words: SiCp/Al-8.5Fe-1.3V-1.7Si composite; multi-layer deposition; ambient temperature mechanical properties; microstructure
