CAJ | 학술논문

采用雾化法制备Cu-Ni-Al粉末，对其进行真空热压烧结制取多孔Cu-Ni-Al合金，研究该材料的微观组织、高温压缩变形行为及其影响因素，分析压缩变形机理。结果表明，多孔Cu合金的抗压强度、弹性模量以及屈服强度随着变形温度的增加、应变速率的减小而减小；多孔Cu合金的压缩变形过程分为初始的线性弹性变形、孔壁的塑性变形、弯曲或断裂的屈服平台区以及孔洞密实化后的塑性变形三个阶段；在高温压缩变形过程中，多孔Cu合金容易在孔洞比较集中，孔壁较薄的地带出现应力集中，发生变形。采用回归分析方法建立多孔Cu合金的高温压缩变形本构方程，得出的计算曲线与试验曲线在压缩变形的第一、二阶段非常吻合，在第三阶段，计算曲线稍微高于试验曲线，分析原因认为可能是多孔Cu合金中的孔隙分布不均有关。
채용무화법제비Cu-Ni-Al분말，대기진행진공열압소결제취다공Cu-Ni-Al합금，연구해재료적미관조직、고온압축변형행위급기영향인소，분석압축변형궤리。결과표명，다공Cu합금적항압강도、탄성모량이급굴복강도수착변형온도적증가、응변속솔적감소이감소；다공Cu합금적압축변형과정분위초시적선성탄성변형、공벽적소성변형、만곡혹단렬적굴복평태구이급공동밀실화후적소성변형삼개계단；재고온압축변형과정중，다공Cu합금용역재공동비교집중，공벽교박적지대출현응력집중，발생변형。채용회귀분석방법건립다공Cu합금적고온압축변형본구방정，득출적계산곡선여시험곡선재압축변형적제일、이계단비상문합，재제삼계단，계산곡선초미고우시험곡선，분석원인인위가능시다공Cu합금중적공극분포불균유관。
The Cu-Ni-Al powders are prepared by atomization method, are hot pressing sintered in the vacuum furnace to prepare the porous Cu-Ni-Al alloy. The microstructure, high-temperature compressive deformation behavior and its effect factors are investigated, respectively. The deformation mechanism of the porous Cu alloy is also analyzed and discussed. The results show that the compression strength, elastic modulus and yield strength decrease with increasing temperature and decreasing strain rate. The compression deformation process is classified in terms of three stages of linear elastic deformation, yield platform area with pore wall buckling, collapse, and plastic deformation with pore densification. In the high temperature compression deformation process, stress concentration and deformation are preferred to occur at the areas with pore concentration and thinner pore walls. The compressive mechanical model of the porous Cu alloy is established using the method of linear regression. It is obvious that the calculation curves is in accordance with the experimental curves in the first and second stages of the deformation process, however, at the third stage, the former is above the experimental curves, which is possibly attributed to the inhomogeneous pore distribution of the porous Cu alloy.