Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-refined Al-7Si Alloy

Li Xiaosong; Cai Anhui; Chen Hua; Zeng Jijie

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Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-refined Al-7Si Alloy
Vol. 29, Issue 6, Pages: 557-560(2009)
Published： 2009 ，
DOI：

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[1]李小松,蔡安辉,陈华,曾纪杰.热处理对B细化Al-7Si合金中α相形态及硬度的影响[J].特种铸造及有色合金,2009,29(06):557-560+488.

Li Xiaosong, Cai Anhui, Chen Hua, et al. Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-refined Al-7Si Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):557-560(2009)
[1]李小松,蔡安辉,陈华,曾纪杰.热处理对B细化Al-7Si合金中α相形态及硬度的影响[J].特种铸造及有色合金,2009,29(06):557-560+488. DOI：

Li Xiaosong, Cai Anhui, Chen Hua, et al. Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-refined Al-7Si Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):557-560(2009) DOI：

摘要

研究了热处理温度和保温时间对B细化Al-7Si合金中的α相形态与硬度的影响

并确定了最佳热处理工艺。结果表明

在450℃下

随着保温时间由3h延长到12h

初生α相的形态由不规则的树枝晶向均匀的粒状等轴晶、再向蔷薇状组织转变

保温6h时晶粒形态最理想;在300～540℃之间保温8h时

随着温度的升高

初生α相逐渐由发达的树枝晶向蔷薇状枝晶和粒状晶转变;在400℃和450℃时

可得到尺寸较小、分布均匀的粒状初生α相;在450℃以上保温时

初生α相又开始向粗大、无规则形态演变。通过正交试验可知

最佳热处理工艺温度为（540±10）℃

保温6h。

Abstract

Effects of heat treatment on morphology of primary α phase and hardness of B-refined Al-7Si alloy were investigated to determine the optimized heat treatment rule.The results indicate that primary α phase is converted from irregular dendrite into uniformly distributed equiaxied granular grain and then into rosette structure with holding for from 3 hours to 12 hours at 450℃

in which the ideal grain morphology can be observed with holding for 6 hours.With holding for 8 hours and increasing temperature from 300 to 540℃

primary α phase is evolved from developed dendrite into rosette and granular structure.Granular primary α phase with smaller size and uniform distribution can be observed in the alloy at 400

50℃

however

with holding at more than 450℃

primary α phase is transformed into irregular coarse morphology.The orthogonal analyses shows that the optimized heat treatment parameters are（540±10）℃ for 6 hours.