CAJ | 학술논문

采用10-6 s-1慢应变拉伸测试手段研究冷轧与拉伸复合预变形对2519A铝合金抗应力腐蚀开裂性能的影响.冷轧7％后再垂直拉伸3％的合金板材抗拉强度和应力腐蚀指数分别为481MPa和0.0429,与冷轧4％后再平行拉伸3％以及冷轧7％后再平行拉伸3％的合金板材相比表现出了更好的力学性能和抗应力腐蚀开裂性能.这主要是由于冷轧7％后再垂直拉伸3％在合金板材中生成了密度更高且分布更均匀的位错组织,使时效后合金板材晶内析出相细小、密集,晶界析出相不连续,晶界无沉淀析出带且较窄.
채용10-6 s-1만응변랍신측시수단연구랭알여랍신복합예변형대2519A려합금항응력부식개렬성능적영향.랭알7％후재수직랍신3％적합금판재항랍강도화응력부식지수분별위481MPa화0.0429,여랭알4％후재평행랍신3％이급랭알7％후재평행랍신3％적합금판재상비표현출료경호적역학성능화항응력부식개렬성능.저주요시유우랭알7％후재수직랍신3％재합금판재중생성료밀도경고차분포경균균적위착조직,사시효후합금판재정내석출상세소、밀집,정계석출상불련속,정계무침정석출대차교착.
The effect of the pre-deformation of rolling combined with stretching on the stress corrosion cracking resistance of aluminum alloy 2519A was studied by means of the slow strain rate technique at 10-6 s-1.The tensile strength and stress corrosion index of the alloy plate with 7％ rolling plus 3％ perpendicular stretching were 481 MPa and 0.0429,respectively,showing better mechanical property and stress corrosion cracking resistance than those with 4％ rolling plus 3％ parallel stretching or 7％ rolling pius 3％ parallel stretching,which is due to its finer and denser precipitates within the grains,discontinuous grain boundary precipitates,as well as more narrow precipitate-free zone width.Such microstructure is attributing to the denser and more homogeneously distributed dislocations which are produced by the pre-deformation.