The phrase "articulate an alternative" is correct and usable in written English.
You can use it when discussing the expression of a different option or solution in a clear and effective manner.
Example: "In our meeting, I encouraged everyone to articulate an alternative to the proposed plan that would better suit our needs."
Alternatives: "express an alternative" or "present a different option".
The test for them however must be to articulate an alternative strategy for Isil's defeat.
The reorganization plan approved yesterday does not articulate an alternative mechanism for public participation.
The failure to articulate an alternative economic strategy has led to the erosion of political support in their old heartlands, where disenchanted voters feel ignored and despised.
Post-match debate coverage did not necessarily allow minor parties the time to articulate an alternative agenda to their more established Westminster rivals.
France's left suffers from being part of that more general international difficulty to articulate an alternative that catches the popular mood and from being a particularly acute local example of that failure.
In a city where one Richard Daley or the other has been mayor for 42 of the last 55 years, it is much easier to criticize the boss than to find a candidate who can raise the campaign money, build the citywide stature needed, and clearly articulate an alternative plan to lead Chicago.
Already in the 1970s, solid-state physicists such as Anderson and Alvin Weinberg had articulated an alternative vision of the science of physics.
Charter 08 has articulated an alternative vision of China, challenging the official line that any decisions on reforms are the exclusive province of the state.
Cato Institute senior fellow Julian Sanchez articulated an alternative reading of this new information in tweets after the Times report about Papadopoulos being the trigger for the FBI's investigation.
In a foreword to "No Enemies, No Hatred," the late Vaclav Havel observed that Charter 08 "articulated an alternative vision of China, challenging the official line that any decisions on reforms are the exclusive province of the state".
The term "flexible specialization" comes from Michael Piore & Chuck Sabel's landmark work, The Second Industrial Divide: Possibilities for Prosperity, which articulates an alternative to the mass production paradigm widely-accepted in the United States.
