粉末冶金工业
粉末冶金工業
분말야금공업
POWDER METALLURGY INDUSTRY
2015年
4期
26-29
,共4页
SiC/2024 Al基复合材料%热挤压%致密度%抗拉强度%强化机理
SiC/2024 Al基複閤材料%熱擠壓%緻密度%抗拉彊度%彊化機理
SiC/2024 Al기복합재료%열제압%치밀도%항랍강도%강화궤리
SiC/2024Al composite%hot extrusion%relative density%tensile strength%strengthening mechanism
采用冷压烧结工艺制备35%SiC/2024Al基（质量分数）复合材料，对烧结后的试样进行热挤压二次成形。利用金相显微镜、透射电镜（TEM）观察热挤压前后材料的微观组织，检测复合材料的物理和力学性能，研究热挤压前后SiC颗粒的分布特征、基体晶粒变化情况以及复合材料的强化机理。结果表明：挤压后的SiC颗粒偏聚现象减少，分布更加均匀，具有一定的“流向”性；挤压后的基体晶粒发生明显的细化；复合材料的致密度和抗拉强度得到明显的提高。
採用冷壓燒結工藝製備35%SiC/2024Al基（質量分數）複閤材料，對燒結後的試樣進行熱擠壓二次成形。利用金相顯微鏡、透射電鏡（TEM）觀察熱擠壓前後材料的微觀組織，檢測複閤材料的物理和力學性能，研究熱擠壓前後SiC顆粒的分佈特徵、基體晶粒變化情況以及複閤材料的彊化機理。結果錶明：擠壓後的SiC顆粒偏聚現象減少，分佈更加均勻，具有一定的“流嚮”性；擠壓後的基體晶粒髮生明顯的細化；複閤材料的緻密度和抗拉彊度得到明顯的提高。
채용냉압소결공예제비35%SiC/2024Al기（질량분수）복합재료，대소결후적시양진행열제압이차성형。이용금상현미경、투사전경（TEM）관찰열제압전후재료적미관조직，검측복합재료적물리화역학성능，연구열제압전후SiC과립적분포특정、기체정립변화정황이급복합재료적강화궤리。결과표명：제압후적SiC과립편취현상감소，분포경가균균，구유일정적“류향”성；제압후적기체정립발생명현적세화；복합재료적치밀도화항랍강도득도명현적제고。
The 35%SiC/2024Al (mass percent) composite was prepared by cold pressing and sintering, and then the specimen was hot-extruded. The microstructure of the material was observed by optical microscope and TEM, the physical and mechanical properties were also tested. The distribution characteristic of SiC particles, change of grains in matrix and the strengthening mechanism of the composite were investigated. The results show that the dis-tribution of SiC particles is more uniform and the segregation decreases after hot-extrusion. The arrangement of SiC particles in the direction of extrusion is more oriental and orderly. The grains of the composite are refined. The densities and tensile strength are increased significantly after hot-extrusion.
