摘要
对热挤压变形得到的4032合金挤压棒不同区域组织进行分析,结合Deform变形过程模拟得到的应力、应变分布可知:较大应变有助于组织的均匀化,使第二相在基体中弥散分布;当硬质相之间距离很近时,较大的应力有利于硬质相的破碎,但当硬质相与基体相接触面积较大时,较大的应力也只能使硬质相产生有限的破碎。对热挤压变形得到的4032合金挤压棒各处形变织构研究表明:4032合金挤压棒中存在强的<111>织构和相对较弱的<100>织构。但在{011}晶面密度较高的<111>织构只在应变和应力都比较小的1/2半径处出现,未在应变最大的边缘处出现,取而代之的是沿挤压方向<111>旋转了19.5°的<211>织构,且挤压棒中心位置也出现了强度比{011}<111>织构强度更高的{011}<655>织构。
Combined with the simulation of stress and strain during the deformation with the Detorm software, the microstructure analysis of 4032 alloy sample obtained by counter extrusion shows that the high strain is helpful to the mierostructure homogenization and the mixture of soft matrix and hard sec- ond phase. The high stress has an obvious contribution to the fragmentation of hard phases which loca- ted among other hard phases, however, this contribution is limited when the hard phases contacted with the soft matrix. The texture analysis shows that the 4032 alloy bar has a strong 〈 111 〉 texture and a relatively weak 〈 100 〉 texture. The 〈 111 〉 texture appears only at the position of half radius of the alloy bar where the strain and stress is lower. However, at the edge where the strain and stress is higher the texture is replaced by the 〈211 〉 texture which originates from the rotation of 〈 111 〉 extrusion direction by 19.5°, at the center of the extruded bar the 1011 / 〈655 〉 texture appears to be stronger than {011t 〈111 〉.
