Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第29卷    第8期    总第245期    2019年8月

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文章编号:1004-0609(2019)-08-1583-08
粉末压制Al-5Ti-1B合金的显微组织与晶粒细化性能
王顺成,康跃华,周 楠,宋东福,郑开宏

(广东省材料与加工研究所,广州 510650)

摘 要: 采用气雾化工艺制备Al-5Ti-1B合金粉,然后压制成Al-5Ti-1B合金,研究了粉末压制Al-5Ti-1B合金的显微组织与晶粒细化性能,并与铸造Al-5Ti-1B合金进行了比较。结果表明:气雾化快速凝固可以抑制TiB2粒子的团聚和细化TiAl3相,使TiB2粒子和TiAl3相均匀分布在粉末压制Al-5Ti-1B合金的α(Al)基体上。在纯铝熔体中添加0.2%(质量分数)的粉末压制Al-5Ti-1B合金并保温2 min,可使纯铝的晶粒组织从粗大的柱状晶细化为平均直径为183 μm的等轴晶。保温时间延长至180 min,纯铝的晶粒平均直径仍保持在229 μm。与铸造Al-5Ti-1B合金相比,粉末压制Al-5Ti-1B合金具有更强的晶粒细化能力和抗细化衰退能力。

 

关键字: 晶粒细化剂;Al-Ti-B合金;气体雾化;粉末压制;快速凝固

Microstructure and grain refining performance of Al-5Ti-1B alloy prepared by powder compaction
WANG Shun-cheng, KANG Yue-hua, ZHOU Nan, SONG Dong-fu, ZHENG Kai-hong

Guangdong Institute of Materials and Processing, Guangzhou 510650, China

Abstract:The Al-5Ti-1B alloy powder was prepared by gas-atomization process and then compacted into Al-5Ti-1B alloy. The microstructure and grain refining performance of powder compacted Al-5Ti-1B alloy were studied and compared with that of conventional cast Al-5Ti-1B alloy. The results show that the rapid solidification during the gas-atomization can inhibit the aggregation of TiB2 particles and refine the size of TiAl3 phase. The TiB2 particles and TiAl3 phases are uniformly distributed in the powder compacted Al-5Ti-1B alloy. With adding 0.2% (mass fraction) powder compacted Al-5Ti-1B alloy in the pure aluminum melt and holding for 2 min, the pure aluminum can be refined from coarse columnar grains to fine equiaxed grains with an average diameter of 183 μm. When the holding time is prolongated to 180 min, the average grain diameter of pure aluminum is still remained at 229 μm. Compared with the conventional cast Al-5Ti-1B alloy, the powder compacted Al-5Ti-1B alloy has a stronger grain refining ability and resistance to grain refinement fading.

 

Key words: grain refiner; Al-Ti-B alloy; gas atomization; powder compaction; rapid solidification

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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