【摘要】 作为以低成本提高现役活塞合金高温性能的初步探索,利用材料高温试验机、扫描电镜、电子探针等手段研究了加入微量混合RE对ZL109活塞合金高温强度和显微组织的影响。试验结果表明,微量混合RE对ZL109合金可起到微合金化作用,提高其高温强度。加入微量富铈混合RE,合金中AlNiCu耐热相数目增多,使合金耐热性提高。此外,微量富铈混合RE可在ZL109合金中形成一种呈颗粒状的Al-Ce-La-Ni-Cu-Si稀土化合物,为合金进一步强化开辟了新思路。更多还原

【Abstract】 The effect of trace addition of RE on high-temperature strength and microstructure of ZL109 piston alloy was investigated by means of Tensile Testing, SEM, EPMA, etc., aiming at improving the high-temperature property of current piston alloy at lower cost. The results show that trace RE can increase the high-temperature ultimate tensile strength(UTS)of ZL109 piston alloy, acting as trace-alloying elements. The number of AlNiCu intermetallic phase in ZL109 alloy increased after trace addition of RE, which helps to the increase of high-temperature UTS. It has also been shown that a kind of granule-shape Al-Ce-La-Ni-Cu-Si RE-rich compound forms in alloy, which provides a new idea to further strengthen ZL109 alloy.更多还原