(1. 燕山大學(xué) 材料科學(xué)與工程學(xué)院， 秦皇島 066004;
2. 戴卡輪轂制造有限公司，秦皇島 066000)
摘 要: 采用掃描電鏡，對ZL101合金的Sr變質(zhì)效果與保溫時間、Sr含量及晶粒尺寸的關(guān)系進(jìn)行了研究。結(jié)果表明：ZL101共晶硅的Sr變質(zhì)具有長效性，且達(dá)到最佳變質(zhì)效果前有一時間間隔；加入的Sr量有一臨界值，超過此值，變質(zhì)效果變化不明顯；若共晶硅越細(xì)小，變質(zhì)效果則越好，達(dá)到最佳變質(zhì)效果的時間也隨之縮短。
關(guān)鍵字: ZL101合金; 變質(zhì)處理; TPRE機制; 晶粒細(xì)化
（1. College of Materials Science & Engineering， Yanshan University，
Qinhuangdao 066004， P.R.China;
2. Dicastal Wheel Manufacturing Ltd， Qinhuangdao 066000，P.R.China）
Abstract: The relationship of Sr-modification effect with holding time, Sr content and grain size of ZL101 alloys was carried out by means of SEM. The results indicate that the Sr modification has long effect and there exists a period when the Sr modification reaches the maximum in the ZL101 alloys. For the addition of Sr exists a critical point. When exceeding it， the effect of Sr modification has not almost altered. The finer the hypoeutectic Si，the more the effect of Sr modification is
Key words: ZL101 alloys; Sr modification; TPRE mechanism; grain refining
