Effects of RE and Sr on Microstructure and Mechanical Properties of ZL101 Alloys with 1.2%Fe

Tang Dachao1; Fan Xiaoming2; Ma Bin2

doi:10.15980/j.tzzz.2012.06.027

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Effects of RE and Sr on Microstructure and Mechanical Properties of ZL101 Alloys with 1.2%Fe
Vol. 32, Issue 6, Pages: 562-565(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.06.027

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[1]唐大超,范晓明,马斌.RE、Sr对高铁ZL101合金组织和性能的影响[J].特种铸造及有色合金,2012,32(06):562-565.

Tang Dachao1, Fan Xiaoming2, Ma Bin2. Effects of RE and Sr on Microstructure and Mechanical Properties of ZL101 Alloys with 1.2%Fe. [J]. Special Casting & Nonferrous Alloys 32(6):562-565(2012)
[1]唐大超,范晓明,马斌.RE、Sr对高铁ZL101合金组织和性能的影响[J].特种铸造及有色合金,2012,32(06):562-565. DOI： 10.15980/j.tzzz.2012.06.027.

Tang Dachao1, Fan Xiaoming2, Ma Bin2. Effects of RE and Sr on Microstructure and Mechanical Properties of ZL101 Alloys with 1.2%Fe. [J]. Special Casting & Nonferrous Alloys 32(6):562-565(2012) DOI： 10.15980/j.tzzz.2012.06.027.

摘要

采用光学显微镜、X射线衍射仪和INSTRON5882材料试验机研究了加入量为0.12%的Sr与不同含量的RE（RE含量分别为0、0.12%、0.24%、0.36%、0.48%和0.60%）复合加入对Fe含量为1.2%的ZL101合金组织和性能的影响。结果表明

在Sr加入量一定的情况下

适量RE与Sr复合变质可明显地改善高铁ZL101合金中的针片状β-Fe相形貌

使其由针状转变为细小的短棒状。同时

可以细化α-Al晶粒

T6热处理使共晶硅变为颗粒状。适量RE能提高Sr变质高铁ZL101合金的抗拉强度

但对其伸长率的提高不明显。当Sr含量为0.12%

RE含量为0.36%时

高铁ZL101合金在T6热处理态下的抗拉强度最大值为213MPa

比对应的铸态168MPa

提高了26.8%。

Abstract

Effects of 0.12%Sr and different RE addition

such as 0

0.12%

0.24%

0.36%

0.48% and 0.60%

on microstructure and mechanical properties of ZL101 alloys with 1.2% Fe were investigated by optical microscope（OM）

X-ray diffraction（XRD）analysis

and INSTRON5882 EUMTS.The results showed that at a fixed Sr addition

the morphology of β-Fe phases in ZL101 alloys can be obviously improved with RE and Sr compound addition

and its structure is converted form needle-like into fine short rod.In the meantime

α-Al grains are refined and eutectic silicon is transformed into granular in the alloy after T6 heat treatment.The proper RE can improve mechanical properties of Al-Si alloys with high Fe content modified by Sr

and the increase of elongation is very slight.With addition of 0.36% RE +0.12% Sr in the alloys

the tensile strength of alloy after T6 heat treatment can reach the maximum 213 MPa

increased by 26.8% compared to 168 MPa of corresponding as-cast alloy.