摘要:
研究了Cr含量对TC4合金显微结构和性能的影响。结果表明,Cr元素能降低TC4合金的β相转变温度,当Cr含量低于3%时,TC4合金具有双态组织,Cr含量高于3%时,TC4合金中相转变完全,α相连续地分布在β相的晶界处;不同Cr含量条件下TC4合金中均存在α相和β相,随着Cr含量增多,TC4合金中β相数量明显增加;随着Cr含量增大,TC4合金的拉伸强度和屈服强度均逐渐升高,其延伸率逐渐降低,当Cr含量为4%时,TC4合金拉伸强度和屈服强度均具有最大值,分别为1 068 MPa和1 697 MPa,其延伸率具有最小值,为9.94%。
Abstract:
In this paper,the influence of Cr content on the microstructure and properties of TC4 alloy was studied.The results show that the Cr element can decrease the transition temperature of β phase in TC4 alloy.When the Cr content is lower than 3% TC4 alloy possesses duplex microstructure,while the phase transition of TC4 alloy is completed and the α phase continuously distributes in the boundaries of β phase with Cr content higher than 3%.The α and β phases coexist in the TC4 alloy with different Cr contents,and the content of β phase obviously increases with increase in Cr content.Both the tensile strength and yield strength of TC4 alloy gradually increase while its elongation percentage decreases,with increase of Cr content.When the Cr content is 4%,the TC4 alloy respectively has a maximum tensile strength and yield strength of 1 068 and 1 697 MPa,as well as a minimum elongation percentage of 9.94%.
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