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I haven't been able to make this work; I want no arrowheads, but black vectors (segments). If I use

VectorPlot[{x, y}, {x, -1, 1}, {y, -1, 1}, 
    VectorStyle -> {{AbsoluteThickness[3], Arrowheads[0], Black}}]

enter image description here

I get the arrowheads.

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  • $\begingroup$ What version are you using? I get no arrowheads in versions 9 and 11: i.stack.imgur.com/RsLNe.png $\endgroup$ – Jason B. Dec 22 '16 at 16:11
  • $\begingroup$ @JasonB I am using Mma 10! $\endgroup$ – usumdelphini Dec 22 '16 at 16:14
  • $\begingroup$ If you quit the kernel and run your code, do you still get the arrowheads? If so, post the graphics output here also. I just tried this on 10.3.1 and it gives the same result. $\endgroup$ – Jason B. Dec 22 '16 at 16:16
  • $\begingroup$ @JasonB i.stack.imgur.com/Au5fo.png $\endgroup$ – usumdelphini Dec 22 '16 at 17:46
  • $\begingroup$ I get no arrowheads using 10.1. $\endgroup$ – David G. Stork Dec 22 '16 at 18:13
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In "10.0 for Mac OS X x86 (64-bit) (June 29, 2014)" I get the same result as the OP. In version 10.1 I get the correct result, so it appears the issue was fixed by then.

To remove the arrowheads in version 10.0, you can use

VectorPlot[{x, y}, {x, -1, 1}, {y, -1, 1}, 
  VectorStyle -> {{AbsoluteThickness[3], Black}}
] /. Arrow -> Line

Mathematica graphics

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